Midrasz do Powtórzonego Prawa 23:2

(Devarim 23:2) "A petzua dakah and a kruth shafchah shall not come into the congregation of the L-rd.": What is a "petzua dakah"? One whose testicles have been injured ("niftzeu") — even one of them. This tells me only of the whole of it. Whence do I derive (the same for) even part of it? From dakah (lit., "crushed," but not entirely).