Matthew 17:9

And as they came down, &c.— Jesus and his disciples having been in the mountain all night, (See Luke 9:37.) the transfiguration may be supposed to have happened either in the day-time, or in the night: that it happened in the night-time is probable, from the disciples falling asleep while Jesus prayed; a circumstance which could hardly happen by day to all the three, and in the open air. Next morning, as they were coming down from the mountain, Jesus charged the Apostles to conceal what they had seen, till he should arise from the dead. He knew that the world, and even his own disciples, were not yet capable of comprehending the design of his transfiguration, nor of the appearance of Moses and Elias; and that if this transaction had been published before his resurrection, it might have appeared incredible, because nothing hitherto but afflictions and persecution had attended him. See Macknight, and for an explication of the following verses, the note on Mark 9:10; Mark 9:50.