Parashas Acharei Mos · Passuk 18:05
Chabad.org — English translation + Rashi
Torah Temima points to Yerushalmi Taanis 4:5.
English: R. Levi: “and live by them” — a person’s eyesight does not return (after certain afflictions) until after forty days.
Aggadic reading of “live by them”
The phrase is also read as a statement about the time required for physical recovery and renewed vitality.