Musnad Ahmad 30:745

Muhammad ibn Bishr narrated to us, Muhammad ibn ‘Amr narrated to us, Abu Salamah narrated to us, from Abu Hurairah, who said: The Messenger of Allah (peace and blessings of Allah be upon him) was asked: "Which deeds are best, and which deeds are most virtuous?" He said: "Faith in Allah and His Messenger." He said: "Then what, O Messenger of Allah?" He said: "Jihad in the way of Allah, the hump of deeds." He said: "Then what, O Messenger of Allah?" He said: "An accepted Hajj."