Parashas Acharei Mos · Passuk 16:28
Chabad.org — English translation + Rashi
Torah Temima points to Yoma 68b.
English: “And the one who burns them” — only the person who actively assists at the moment of burning contracts garment impurity, not the one who merely lights the fire or arranges the woodpile.
Definition of “the burner”
Tumat begadim attaches only to one who participates in the actual burning act, not to preliminary helpers.