Reference for Keritot 6:58

לא בעינן מעשה

and when the difficulty was pointed out that prostration was not an action, Resh Lakish replied that this ruling was in accordance with R'Akiba who held that [weighty] action was not essential; while R'Johanan said: The ruling might conform even to the view of the Rabbis, for the bending of stature<span class="x" onmousemove="('comment',' When prostrating.');">³³</span>

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