Parashas Acharei Mos · Passuk 17:13
Chabad.org — English translation + Rashi
Torah Temima points to Chullin 87a.
English: If one covered and it became uncovered, he is exempt from covering again — the verse’s “and cover it” is a limiting expression.
No repeated covering
Once properly covered, a later uncovering does not re-trigger the obligation (unlike returning a lost object).