Parashas Metzora · Passuk 15:31
Chabad.org — English translation + Rashi
Torah Temima points to R’ Yochanan in the name of R’ Shimon bar Yochai.
English: “And you shall separate …” — it was taught: R’ Yochanan said in the name of R’ Shimon bar Yochai: Anyone who does not separate from his wife near her expected period — even if he has children like the sons of Aharon — they die, as it is stated “And you shall separate …” and adjacent to it “After the death of the two sons of Aharon.”
Severity of non-separation near veses
Chazal link this warning to the adjacent narrative of Nadav and Avihu, underscoring the gravity of failing to separate near the expected period.