Musnad Ahmad 27:303

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