The Book on Salutations and Greetings (Kitab As-Salam)

Muslim :: Book 26 : Hadith 5404

Anas reported that when Allah's Messenger (may peace be upon him) was in the company of one of his wives a person happened to pass by them. He called him and when he came, he said to him: 0 so and so, she was my such and such wife. Thereupon he said, Allah's Messenger, if I were to doubt at all, I would have entertained no doubt about you at least. Thereupon Allah's Messenger (may peace be upon him) said: Verily Satan circulates in the body like blood.