Commentary 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.
Daf Shevui to Avodah Zarah
The Talmud tries to solve the question by looking at another sugya in which the concept of “disqualification” appears. The blood of a wild animal (deer) or bird that has been slaughtered must be covered. If one covered it up and then it became uncovered, since he has fulfilled the mitzvah, he need not do it over again. If the wind covered it, and then again uncovered it, he must cover it. But if the wind covered it and it remains covered, he need not perform mitzvah.
The Talmud then analyzes the concept behind this last law. If the wind covered it then the mitzvah was fulfilled. So why should it matter if the wind again uncovers it. Once the mitzvah has been fulfilled, it should not need to be fulfilled again. This seems to prove that there is no concept of “disqualification” with regard to mitzvot. Even though the mitzvah was fulfilled, in a sense “disqualified” from needing to be fulfilled, it needs to be fulfilled again.
The Talmud then analyzes the concept behind this last law. If the wind covered it then the mitzvah was fulfilled. So why should it matter if the wind again uncovers it. Once the mitzvah has been fulfilled, it should not need to be fulfilled again. This seems to prove that there is no concept of “disqualification” with regard to mitzvot. Even though the mitzvah was fulfilled, in a sense “disqualified” from needing to be fulfilled, it needs to be fulfilled again.
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