Mesorat%20hashas for Kiddushin 157:11

התם תרתי לריעותא הכא חדא לריעותא

For we learnt: If a mikweh is measured and found to be deficient:<span class="x" onmousemove="('comment',' In water; a mikweh, to be ritually fit, must contain not less than forty se'ahs.');">¹⁴</span> all acts of purification which have heretofore been effected through it, whether in private or in public ground, are unclean!<span class="x" onmousemove="('comment',' If a doubt of uncleanness arises in private ground, the object in doubt is declared unclean; in public ground, it is clean, v. Sot. 28b. Here, wherever it is, the objects are unclean. This proves that we do not regard it as a matter of doubt, but assume that since the mikweh is deficient now, it was so before too. Then, by analogy, why not assume that since the woman is a bogereth now, she was one from the beginning of the day?');">¹⁵</span>

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