Qutaybah ibn Sa'id narrated to us, Layth narrated to us — and Muhammad ibn Rumh ibn al-Muhajir narrated to us, al-Layth informed us, from Yazid ibn Abi Habib, from Abu al-Khayr, from 'Abdullah ibn 'Amr, that a man asked the Messenger of Allah, peace and blessings be upon him, "Which aspect of Islam is best?" He said: "Feed the food, and greet with peace those whom you know and those you do not know."