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: he ordered to keep the whole of this a secret from every man, even from their fellow disciples, 
 till the Son of man were risen from the dead;
 (See Gill on Matthew 17:9).