TT #285 · Parshas Tazria · Aliyah 7 · Passuk 53
English: But if the priest examines it and the lesion has not spread in the garment, warp or woof, or any leather article,
Torah Temimah cites Sifra (Toras Kohanim) for a garment lesion that remains stationary.
Sifra — Vayikra 13, Midrash Sefer
English: 'It has not spread' describes a lesion that remains stationary.
Textual derivation
The phrase “it has not spread” describes a garment affliction that remains in its prior state rather than extending.