John Mark
Mark 9:3BSB·traditional attribution

His clothes became radiantly white, brighter than any launderer on earth could bleach them.

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 his raiment became shining,.... With the rays of glory and brightness which darted from his body through his clothes, and made them as bright as the light of the sun at noon day: and exceeding white as snow; than which nothing is whiter; so as no fuller on earth can white them.

Albert Barnes Presbyterian @notesbybarnes

Verse 3. No fuller. Rather, no scourer. The office of the person here mentioned was to scour or whiten cloth; not to full it, or to render it thicker. (r) "exceeding white"