Musannaf Ibn Abi Shayba 21:778

Hushaym narrated to us, he said: Abd al-Aziz ibn Suhayb narrated to us, from Anas ibn Malik, who said: When the Prophet, peace and blessings of Allah be upon him, would enter the privy, he would say: "I seek refuge in Allah from the male and female devils (al-khubuth wa al-khaba'ith)."