Musannaf Ibn Abi Shayba 27:802

Waki’ narrated to us, from ‘Ikrimah ibn ‘Ammar, from Salim, from Ibn ‘Umar, who said: The Messenger of Allah (may Allah bless him and grant him peace) came out from the house of ‘Aisha and said: "The head of disbelief is from here, from where the horn of Satan rises," meaning the East.