Bede the Venerable — as excerpted in the Catena Aurea on Mark 9:1-8

“(ubi sup.) And by the garments of the Lord are meant His saints, who will shine with a new whiteness. By the fuller we must understand Him, to whom the Psalmist says, (Ps. 51) Wash me throughly from my wickedness, and cleanse me from my sin; for He cannot give to His faithful ones upon earth that glory which remains laid up for them in heaven.”