Musannaf Ibn Abi Shayba 21:783

Waki' narrated to us, from Isra'il, from al-Zibriqan al-'Abdi, from al-Dahhak, who said: When you enter the privy, say: "O Allah, I seek refuge in You from the filth, the impure, the foul, the foul-doer, and the accursed Satan."