Lady Aisha (may Allah be pleased with her) says: One night I found the Messenger of Allah (peace and blessings be upon him) absent from his bed, so I thought he must have gone to his slave woman Maria. So I got up and started feeling along the wall, and I saw that the Messenger of Allah (peace and blessings be upon him) was standing and performing prayer. So I put my hand in the hair of the Messenger of Allah (peace and blessings be upon him) to see whether he had performed ghusl or not. When he finished, he said: "O Aisha! Has your devil seized you?" I said: O Messenger of Allah! Do I also have a devil? He (peace and blessings be upon him) said: "Yes! Every son of Adam has a devil." I said: Even you? He (peace and blessings be upon him) said: "Yes! Even I have a devil, but Allah has helped me against him, so I am safe from him."