Musannaf Ibn Abi Shayba 27:768

Husayn ibn Ali narrated to us, from Mujammi’ ibn Yahya, from Sa’id ibn Abi Burdah, from Abi Burdah, from his father, who said: The Messenger of Allah (peace and blessings of Allah be upon him) said: "My companions are a security for my Ummah. So when my companions are gone, there will come to my Ummah what they have been promised."