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, 31 who having appeared in glory, spake of his outgoing that he was about to fulfil in Jerusalem, 32 but Peter and those with him were heavy with sleep, and having waked, they saw his glory, and the two men standing with him. 33 And it came to pass, in their parting from him, Peter said unto Jesus, 'Master, it is good to us to be here; and we may make three booths, one for thee, and one for Moses, and one for Elijah,' not knowing what he saith: 34 and as he was speaking these things, there came a cloud, and overshadowed them, and they feared in their entering into the cloud, 35 and a voice came out of the cloud saying, 'This is My Son—the Beloved; hear ye him;' 36 and when the voice was past, Jesus was found alone; and they were silent, and declared to no one in those days anything of what they have seen.
Matthew Henry's Commentary on Luke 9:28-36
Commentary on Luke 9:28-36
(Read Luke 9:28-36)
Christ's transfiguration was a specimen of that glory in which he will come to judge the world; and was an encouragement to his disciples to suffer for him. Prayer is a transfiguring, transforming duty, which makes the face to shine. Our Lord Jesus, even in his transfiguration, was willing to speak concerning his death and sufferings. In our greatest glories on earth, let us remember that in this world we have no continuing city. What need we have to pray to God for quickening grace, to make us lively! Yet that the disciples might be witnesses of this sign from heaven, after awhile they became awake, so that they were able to give a full account of what passed. But those know not what they say, that talk of making tabernacles on earth for glorified saints in heaven.