TT #134 · Parshas Tazria · Aliyah 2 · Passuk 13
English: When the priest sees that the eruption has covered the whole body, he shall pronounce the affected person clean; when it has all turned white, that person is clean.
Chabad.org — Chumash, English translation + Rashi for Vayikra 13:13
Torah Temimah cites Sanhedrin 97a for an aggadic reading of the rule that a person covered entirely in white is declared clean.
E-Daf — Sanhedrin 97a · Shas.org · Sefaria — Sanhedrin 97a
English: Rabbi Yitzchak said: The Messiah will not come until the entire kingdom has turned to heresy; Rava derives this from the verse, “All of it has turned white; he is clean.”
Textual derivation
The Gemara reads the rule that a fully white person is clean as an allusion to the future transformation of the kingdom into heresy before the coming of Mashiach.