Commentary for Zevachim 42:1

איכא בינייהו גזירת שיקוע

- They disagree as to a preventive measure in respect of sinking [the laver].<span class="x" onmousemove="('comment',' When R. Johanan rules that the laver must not be brought up for a service the following day, it is not because its water is unfit if it is not in the pit during any part of the night, but as a preventive measure, lest it is not lowered again before dawn, which would disqualify it. Hence R. Johanan does not say that the water is unfit, but merely that the laver must not be brought up.');">¹</span> But surely R'Johanan said: If [the priest] sanctified his hands for the removal of the ashes, he need not sanctify [them again] on the morrow, because he has already sanctified [them] at the beginning of the service.<span class="x" onmousemove="('comment',' V. supra 20a. Thus the laver is drawn up before dawn, and R. Johanan does not add that it must be lowered again immediately before dawn.');">²</span>

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