Parashas Metzora · Passuk 14:02
Chabad.org — English translation + Rashi
Torah Temima points to Toras Kohanim.
English: “On the day of his purification” — this teaches that both his purification and his declaration of impurity take place by day.
Mi’ut from “byom”
Chazal teach that the critical rulings of tumah and taharah for the metzora must be performed during the daytime.