Musannaf Ibn Abi Shayba 27:750

Waki’ narrated to us, he said: Al-A’mash narrated to us, he said: Suhayl ibn Abi al-Asad narrated to us, from Bukayr al-Jazari, from Anas, he said: The Messenger of Allah (may Allah bless him and grant him peace) came to us while we were in the house of a man from the Ansar. He took hold of the two doorposts, then said: "The Imams are from Quraysh."