Musannaf Ibn Abi Shayba 1:2050

Abu Bakr narrated to us, he said: Muhammad ibn Bishr al-‘Abdi and Abu Usamah narrated to us, they said: Mis‘ar narrated to us, from ‘Amr ibn Ayyub, from al-Sha‘bi, he said: Indeed, for the devil there is a "zaffah," meaning the wetness at the tip of the urethra.