The Two and Three Witnesses of Christ’s Transfiguration:
Upon the mount was represented the future kingdom of glory.
The witness of the three disciples: Peter, James, and John at Christ’s transfiguration. See Matt. 17: 1-8; Mark 9: 2-8; Luke 9: 28-36. :
“Not all, even of the twelve, can receive the revelation He desired to give. Only the three who are to witness His anguish in Gethsemane have been chosen to be with Him on the mount. Now the burden of His prayer is that they may be given a manifestation of the glory that He had with the Father before the world was, that His kingdom may be revealed to human eyes, and that His disciples might be strengthened to behold it. He pleads that they may witness a manifestation of His divinity that will comfort them in the hour of His supreme agony with a knowledge that He is of a surety the Son of God and that His shameful death is a part of the plan of redemption.” – Desire of Ages, pp. 420-1.