Reference for Zevachim 169:10

פשיטא לעולם אחיין ובדוקין שבעין ואליבא דר"ע דאמר אם עלו לא ירדו

How have you explained it? As referring to unfit [animals]! Then consider the final clause: IF A BURNT-OFFERING WENT UP ALIVE TO THE TOP OF THE ALTAR, IT MUST DESCEND.

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