John Mark
Mark 9:9ESV·traditional attribution

And as they were coming down the mountain, he charged them to tell no one what they had seen, until the Son of Man had risen from the dead.

Matthew Henry Presbyterian @wholebiblehenry

Here is, I. A prediction of Christ's kingdom now near approaching, Mar 9:1. That which is foretold, is, 1. That the kingdom of God would come, and would come so as to be seen: the kingdom of the Messiah shall be set up in the world by the utter destruction of the Jewish polity, which stood in the way of it; this was the restoring...

Commenting on Mark 9:1-13

John Gill Reformed Baptist @doctorgill

And as they came down from the mountain,.... Christ and his three disciples, Peter, James, and John, whom he led up thither: he charged them that they should tell no man what things they had seen; on the mount, as the transfiguration of himself, the persons of Moses and Elias, and the bright cloud from whence the voice came, which bore testimony of Christ's sonship...

William Burkitt Anglican @expositoryburkitt

Observe here, 1. The strict injunction given by Christ to his disciples, not to publish or proclaim this glorious vision at his transfiguration, till after his resurrection; because being now in a state of humiliation, he would have his divine majesty and glory veiled and concealed.