Musnad Ahmad 30:3037

Waki’ narrated to us, Hammad bin Salamah narrated to us, from Hakim al-Athram, from Abu Tamimah, from Abu Hurairah, who said: The Messenger of Allah (peace and blessings of Allah be upon him) said: "Whoever has intercourse with a menstruating woman, or with a woman in her anus, or [goes to] a soothsayer and believes what he says, then he has disbelieved in what was revealed to Muhammad."