Parashas Metzora · Passuk 14:42
Chabad.org — English translation + Rashi
Torah Temima points to Toras Kohanim.
English: “Other stones” — if [only] “stones,” one might think he may take stones from one side [of the house] and bring them to the other side; therefore it says “other.”
New stones required
Chazal require genuinely different stones, not merely relocated stones from the same house.