Luke 9:28

28 And it came to pass, after these words, as it were eight days, that having taken Peter, and John, and James, he went up to the mountain to pray,

Luke 9:28 Meaning and Commentary

Luke 9:28

And it came to pass, about an eight days after those
sayings
About a week after he had declared the above things, at, or near to Caesarea Philippi. The other evangelists, Matthew and Mark, say it was six days after: the reason of this difference is, because Luke takes in the day in which he delivered these sayings, and that in which he was transfigured, and they only reckon the intermediate days:

he took Peter, and John, and James;
the same that he admitted to be with him at the raising of Jairus's daughter, and in the garden afterwards:

and went up into a mountain to pray;
to his God and Father, that his disciples might have a visible display of his glory, as an emblem and pledge of that in which he shall hereafter appear: it was usual with Christ to go up into a mountain to pray; ( Matthew 14:23 ) ( Luke 6:12 ) . (See Gill on Matthew 17:1).

Luke 9:28 In-Context

26 `For whoever may be ashamed of me, and of my words, of this one shall the Son of Man be ashamed, when he may come in his glory, and the Father's, and the holy messengers';
27 and I say to you, truly, there are certain of those here standing, who shall not taste of death till they may see the reign of God.'
28 And it came to pass, after these words, as it were eight days, that having taken Peter, and John, and James, he went up to the mountain to pray,
29 and it came to pass, in his praying, the appearance of his face became altered, and his garment white -- sparkling.
30 And lo, two men were speaking together with him, who were Moses and Elijah,
Young's Literal Translation is in the public domain.