King James Version, Updated™

KJV:   1 And after six days Jesus taketh Peter, James, and John his brother , and bringeth them up into an high mountain apart,

KJVu: 1 After six days Jesus took Peter, James, and John his brother up on a high mountain by themselves.

Notes: "Apart" highlighted in the KJV verse is Strong’s G2596 with a Thayer’s Greek Lexicon definition of "alone (by himself)."

KJV:   2 And was transfigured before them : and his face did shine as the sun, and his raiment was white as the light.

KJVu: 2 There Jesus was transfigured before them , and his face shined as the sun, and his clothing was white as the light.

Notes: Many translations replaced "did shine" with "shone." Some claim hard and fast rules for their different uses, while others claim the words are interchangeable. The Grammarist stated "As a writer and former editor, one of the questions I’ve heard several times is whether it’s right to say “shined” or “shone.” The truth is, they’re both right. They’re both used as the past tense of shine. …​ [Shone is] more commonly used in the UK. In America, we use “shined” as the past tense form of “shine” and would say the sun shined brightly yesterday." KJVu used "Shined."

KJV:   3 And, behold, there appeared unto them Moses and Elias talking with him.

KJVu: 3 Then, behold, there appeared to them Moses and Elijah talking with him.

Notes: "Elias" highlighted in the KJV verse is Strong’s G2243 with a Strong’s definition of "Elijah, an Israelite prophet."

KJV:   4 Then answered Peter, and said unto Jesus, Lord, it is good for us to be here : if thou wilt, let us make here three tabernacles ; one for thee, and one for Moses, and one for Elias.

KJVu: 4 And Peter spoke and said to Jesus, "Lord, it is good for us to be here ; if you will, let us make here three tabernacles : one for you, one for Moses, and one for Elijah. "

Notes: "Answered" highlighted in the KJV verse is Strong’s G611 with a Thayer’s Greek Lexicon definition of "to begin to speak, but always where something has preceded (either said or done) to which the remarks refer ."

KJV:   5 While he yet spake, behold, a bright cloud overshadowed them : and behold a voice out of the cloud, which said, This is my beloved Son, in whom I am well pleased; hear ye him.

KJVu: 5 While he was still speaking, behold, a bright cloud overshadowed them , and behold a voice out of the cloud said, "This is my beloved Son, in whom I am well pleased; all of YOU, hear him. "

Info: Since "hear ye him" is plural KJVu uses "All of YOU hear him" to show that the voice (God) was speaking to more than just Peter. If the "YOU" is dropped that meaning would be lost. Most translations just drop the "ye/you" thus the distinction is lost.

KJV:   6 And when the disciples heard it, they fell on their face, and were sore afraid.

KJVu: 6 When the disciples heard it, they fell on their faces, and were very afraid.

Notes: "Sore" highlighted in the KJV verse is Strong’s G4970 with a Strong’s definition of "very much."

KJV:   7 And Jesus came and touched them, and said, Arise, and be not afraid.

KJVu: 7 And Jesus came and touched them, and said, "Arise, and do not be afraid. "

KJV:   8 And when they had lifted up their eyes, they saw no man, save Jesus only.

KJVu: 8 When they lifted up their eyes, they saw no man, except Jesus only.

KJV:   9 And as they came down from the mountain, Jesus charged them, saying, Tell the vision to no man, until the Son of man be risen again from the dead.

KJVu: 9 As they came down from the mountain, Jesus commanded them, saying, "Tell the vision to no man, until the Son of man has risen again from the dead. "

Notes: "Charged" highlighted in the KJV verse is Strong’s G1791 with a Strong’s definition of "to enjoin, to charge, command."

KJV:   10 And his disciples asked him, saying, Why then say the scribes that Elias must first come?

KJVu: 10 His disciples asked him, saying, "Then why do the scribes say that Elijah must come first?"

KJV:   11 And Jesus answered and said unto them, Elias truly shall first come, and restore all things.?

KJVu: 11 Jesus answered and said to them, "Truly, Elijah shall come first, and restore all things.

KJV:   12 But I say unto you, That Elias is come already, and they knew him not, but have done unto him whatsoever they listed. Likewise shall also the Son of man suffer of them.

KJVu: 12 But I say to you, That Elijah has already come, and they did not know, but did to him whatever they desired. Likewise the Son of man shall also suffer by them. "

Notes: "Listed" highlighted in the KJV verse is Strong’s G2309 with a Strong’s Exhaustive Concordance definition of "desire, be disposed toward, intend -|- Thel'-o or thel'-o or in certain tenses theleo thel-eh'-o, and etheleo eth-el-eh'-o, which are otherwise obsolete; apparently strengthened from the alternate form of haireomai; to determine (as an active option from subjective impulse; whereas boulomai properly denotes rather a passive acquiescence in objective considerations), i.e. Choose or prefer (literally or figuratively); by implication, to wish, i.e. Be inclined to (sometimes adverbially, gladly); impersonally for the future tense, to be about to; by Hebraism, to delight in — desire, be disposed (forward), intend, list, love, mean, please, have rather, (be) will (have, -ling, - ling(-ly))."

KJV:   13 Then the disciples understood that he spake unto them of John the Baptist.

KJVu: 13 Then the disciples understood that he spoke to them of John the Baptist.

KJV:   14 And when they were come to the multitude, there came to him a certain man, kneeling down to him, and saying,

KJVu: 14 When they came to the multitude, there came to him a certain man, kneeling down to him, and saying,

KJV:   15 Lord, have mercy on my son : for he is lunatick, and sore vexed: for ofttimes he falleth into the fire, and oft into the water.

KJVu: 15 "Lord, have mercy on my son , for he is epileptic, and miserably sick, for he often falls into the fire, and often into the water.

Notes:

KJV:   16 And I brought him to thy disciples, and they could not cure him.

KJVu: 16 So I brought him to your disciples, and they could not cure him.

KJV:   17 Then Jesus answered and said, O faithless and perverse generation, how long shall I be with you? how long shall I suffer you? bring him hither to me.

KJVu: 17 Then Jesus answered and said, "O faithless and perverse generation, how long shall I be with you? How long shall I bear with you? Bring him here to me. "

Notes: "Suffer" highlighted in the KJV verse is Strong’s G430 with a Strong’s Exhaustive Concordance definition of "bear with, endure, forbear, suffer. -|- Middle voice from ana and echo; to hold oneself up against, i.e. (figuratively) put up with — bear with, endure, forbear, suffer."

KJV:   18 And Jesus rebuked the devil ; and he departed out of him : and the child was cured from that very hour.

KJVu: 18 Jesus rebuked the devil , and he departed out of him , and the child was cured from that very hour.

KJV:   19 Then came the disciples to Jesus apart, and said, Why could not we cast him out?

KJVu: 19 Then the disciples came to Jesus privately, and said, "Why could we not cast him out?"

Notes: "Apart" highlighted in the KJV verse is Strong’s G2596 with a Thayer’s Greek Lexicon definition of "of the place where: κατ' οἶκον (opposed to ἐν τῷ ἱερῷ), at home, privately (Winer’s Grammar, 400 (374) note{1}), Acts 2:46; Acts 5:42.."

KJV:   20 And Jesus said unto them, Because of your unbelief : for verily I say unto you, If ye have faith as a grain of mustard seed, ye shall say unto this mountain, Remove hence to yonder place; and it shall remove; and nothing shall be impossible unto you.

KJVu: 20 Jesus said to them, "Because of your unbelief ; for truly I say to you, If YOU have faith as a grain of mustard seed, YOU shall say to this mountain, 'Move from here to there,' and it shall move; and nothing shall be impossible for you.

Notes: "Yonder" highlighted in the KJV verse is Strong’s G1563 with a Strong’s definition of "there, to there."

KJV:   21 Howbeit this kind goeth not out but by prayer and fasting.

KJVu: 21 But this kind does not go out except by prayer and fasting. "

Notes: "Howbeit" highlighted in the KJV verse is Strong’s G1161 with a Strong’s Exhaustive Concordance definition of "also, and, but, moreover, now. -|- A primary particle (adversative or continuative); but, and, etc. — also, and, but, moreover, now (often unexpressed in English)."

KJV:   22 And while they abode in Galilee, Jesus said unto them, The Son of man shall be betrayed into the hands of men :

KJVu: 22 While they dwelled in Galilee, Jesus said to them, "The Son of man shall be betrayed into the hands of men ,

Notes: "Abode" highlighted in the KJV verse is Strong’s G390 with a Thayer’s Greek Lexicon definition of "to turn hither and thither; passive reflexively, to turn oneself about, sojourn, dwell, ἐν in a place; -|- a. literally: Matthew 17:22." Per the Grammarist, in American English, the past tense and past participle of dwell is usually "dwelled." In varieties of English from outside North America, "dwelt" is the preferred form. Both are common in Canadian English.

KJV:   23 And they shall kill him, and the third day he shall be raised again. And they were exceeding sorry.

KJVu: 23 and they shall kill him, and the third day he shall be raised again. " And they were exceedingly sorry.

Info: Geneva Bible of 1587 used "shall he rise againe."

KJV:   24 And when they were come to Capernaum, they that received tribute money came to Peter, and said, Doth not your master pay tribute?

KJVu: 24 When they came to Capernaum, those that collected tribute money came to Peter, and said, "Does your master not pay tribute? "

Notes: "Received" highlighted in the KJV verse is Strong’s G2983 with a Thayer’s Greek Lexicon definition of "to take a thing due according to agreement or law, to collect, gather (tribute): τά δίδραχμα, Matthew 17:24; τέλη ἀπό τίνος, 25; δεκάτας, Hebrews 7:8f; καρπούς, Matthew 21:34; παρά τῶν γεωργῶν ἀπό τοῦ καρποῦ, Mark 12:2."

Info: "Tribute" in the verses above is Strong’s G1323 with a Thayer’s Greek Lexicon definition of "a didrachmon or double-drachma, a silver coin equal to two Attic drachmas or one Alexandrian, or half a shekel (about one third of a dollar) (see in ἀργύριον, 3): Matthew 17:24." Some translations use "Temple Tax" in the place of "Tribute."

KJV:   25 He saith, Yes. And when he was come into the house, Jesus prevented him, saying, What thinkest thou, Simon? of whom do the kings of the earth take custom or tribute ? of their own children, or of strangers?

KJVu: 25 He said, "Yes." And when he came into the house, Jesus prevented him from speaking, saying, "What do you think, Simon? From whom do the kings of the earth take custom or tribute , from their own children, or from strangers? "

KJV:   26 Peter saith unto him, Of strangers. Jesus saith unto him, Then are the children free.

KJVu: 26 Peter said to him, "From strangers. " Jesus said to him, "Then the children are free. "

KJV:   27 Notwithstanding, lest we should offend them, go thou to the sea, and cast an hook, and take up the fish that first cometh up; and when thou hast opened his mouth, thou shalt find a piece of money : that take, and give unto them for me and thee.

KJVu: 27 But, lest we offend them, you go to the sea, cast a hook, and take the fish that comes up first, and when you open his mouth, you shall find a piece of money ; take that, and give to them for me and you."

Notes: "Notwithstanding" highlighted in the KJV verse is Strong’s G1161 with a Strong’s definition of "but, and, now, (a connective or adversative particle)."