It is narrated from Sayyiduna Zayd bin Thabit (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "I have left among you two successors: the Book of Allah and my Ahl al-Bayt (household), and the two of them will never separate until they come to me at the Pond (Hawd)."
Hadith Referenceالمعجم الكبير للطبراني / باب الزاي / 4902