Parashas Metzora · Passuk 14:35
Chabad.org — English translation + Rashi
Torah Temima points to Toras Kohanim.
English: “And he shall tell the kohen, saying” — “and he shall tell” teaches that the kohen investigates how the nega came to his house. “Saying” — the kohen shall speak words of rebuke to him: “My son, negaim come only because of lashon hara.”
Kohen’s investigation and rebuke
Chazal require the kohen both to inquire into the circumstances and to offer moral counsel linking the affliction to lashon hara.