Abu Saeed Khudri narrates from the Holy Prophet (s.a.w.a.), “Surely I leave in your midst two heavy things, if you fasten unto them you will never be deviated after me. One of these is greater than the other one viz. i) the Book of Allah is the rope stretched from the skies to the earth and ii) my progeny, my Ahle Bait. Know that both these will never separate from each other until they meet me at the Pond of Kausar.”
Behaar al-Anwaar v 23 p 106 from