TT #310 · Parshas Tazria · Aliyah 7 · Passuk 59
English: This is the law of the lesion of tzaraas in a garment of wool or linen, in warp or woof, or in any leather article, to declare it clean or impure.
Chabad.org — Chumash, English translation + Rashi for Vayikra 13:59
Torah Temimah cites Sifra (Toras Kohanim) for the application of the priestly ruling outside the Land of Israel.
Sifra — Vayikra 13, Midrash Sefer
English: Just as the mitzvah applies in the Land of Israel, so it applies outside the Land as well.
Textual derivation
The duty to make the correct ruling on the article’s status applies both in the Land of Israel and in the Diaspora.