Reference for Avodah Zarah 93:8

תפשוט ליה מדתנן כיסהו ונתגלה פטור מלכסות כיסהו הרוח חייב לכסות ואמר רבה בר בר חנה א"ר יוחנן לא שנו אלא שחזר ונתגלה אבל לא חזר ונתגלה פטור מלכסות

You can solve this problem from what we have learned: If one covered it [blood of a wild animal or bird that had been slaughtered], and it became uncovered, he is exempt from having to cover it again; but if the wind covered it, he is obligated to cover it himself. And Rabbah b. Bar Hanah said in the name of R. Yohanan: This was taught only when the wind again uncovered it, but if the wind did not again uncover it, he is exempt from having to cover it.

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