My father (rh) narrated to us. He said: Sa`d b. `Abdullah narrated to us. He said: Muhammad b. al-Husayn b. Abi’l Khattab narrated to us from Ja`far b. Bashir from Hijr b. Za’ida from Abi `Abdillah al-Sadiq (as). He said
Whoever deliberately leaves off a single hair from [purification after] sexual impurity, then he is in the Fire.