Parashas Metzora · Passuk 14:02
Chabad.org — English translation + Rashi
Torah Temima points to Megillah 21a (verified on the daf).
E-Daf.com — Tsurras Hadaf (size=3)
HebrewBooks / Shas PDF of the daf
English: “On the day of his purification” — the entire day is valid for the purification of the metzora, as it is written “on the day of his purification.”
General rule of daytime mitzvos
Chazal teach that the purification rites of the metzora may be performed at any hour of the day.