Reference for Niddah 14:59

ותו ליכא

by liquids,<span class="x" onmousemove="('comment',' Through contracting uncleanness from a dead creeping thing. The latter being a primary uncleanness causes the liquids to be an uncleanness of the first grade which (though Pentateuchally, since their uncleanness is not a primary one, it cannot, as explained in Pes. 18a, convey uncleanness to vessels) renders the vessels unclean Rabbinically. As the uncleanness that is conveyed to vessels by liquids is merely Rabbinical, and as it was desired to make a distinction between Pentateuchal and Rabbinical uncleanness, it was enacted that, in such a case, only the outsides of vessels and not their insides shall contract the uncleanness. ');">⁵³</span>

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