TT #179 · Parshas Tazria · Aliyah 5 · Passuk 27
English: The priest shall examine him on the seventh day. If the lesion has spread in the skin, the priest shall pronounce him unclean; it is a tzaraas affliction.
Chabad.org — Chumash, English translation + Rashi for Vayikra 13:27
Torah Temimah cites Sifra (Toras Kohanim) for the additional limitations derived from repeated “it is” wording.
Sifra — Vayikra 13, Midrash Sefer
English: Why does the verse repeat 'it is' three times? The repetitions mark further limits and extensions.
Textual derivation
The Sifra treats each repetition of “it is” as a separate basis for the limitations developed in the following units.