Parashas Metzora · Passuk 15:33
Chabad.org — English translation + Rashi
Torah Temima points to Shabbos 64b (early elders / R’ Akiva).
English: “And the one who is ill in her niddah” — it was taught: The early elders used to say “and the one who is ill in her niddah” — that she should not paint her eyes, nor rouge, nor adorn herself with colored garments.
Early restriction on adornment
The early elders restricted a niddah’s adornment; R’ Akiva later taught that this itself could lead a husband to divorce, and the verse is read as requiring her to remain in niddah status until immersion.