It is narrated from Sayyiduna Abu Sa'id Khudri (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "I am leaving among you two precious things; one of them is greater than the other. The Book of Allah is a rope extended from the sky to the earth, and my progeny, my Ahl al-Bayt. These two will not separate until they both come to me at the Pond."