It is narrated from Sayyiduna Jabir bin Abdullah (may Allah be pleased with them both), he says: I saw the Messenger of Allah (peace and blessings be upon him) on the day of Arafah during Hajj, he was delivering a sermon while mounted on his she-camel "Qaswa." I heard him say: "O people! I am leaving among you such (two) things that if you hold fast to them, you will never go astray: (1) The Book of Allah, and (2) my progeny, that is, my Ahl al-Bayt."