Musannaf Ibn Abi Shayba 1:1201

Shababa narrated to us, he said: Shu'bah narrated to us, from Qatadah, from 'Uqbah ibn Sahban, he said: I heard 'Abdullah ibn Mughaffal al-Muzani saying: Urination in the place of bathing brings about obsessive whispers (waswas) from it.