Reference for Temurah 57:12

אין מוקצה אסור אלא עד שיעבדו

Raba son of R'Adda reported in the name of R'Isaac: Mukzeh remains forbidden only until it has been used for some work.<span class="x" onmousemove="('comment',' Whereby its designation for the idolatrous altar is annulled. This is Rashi's second interpretation which he prefers. The first interpretation is: Mukzeh is forbidden only when some work has been done with it, but previous to this there is no prohibition for the altar.');">⁸</span>

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