Reference for Chullin 72:10

עשאוהו כהכשר מים מדרבנן

[I should have said that] in that case only was it necessary for the food to be first moistened by water, [for the law regarding reptile uncleanness is not so rigorous], inasmuch as a reptile does not render a person unclean for seven days; but with regard to corpse uncleanness, inasmuch as a corpse will render a person unclean for seven days.

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