Musnad Abu Ya'la al-Mawsili 3:116

Khalaf ibn Hisham narrated to us, Abu al-Ahwas narrated to us, from Mansur, from Rib'i, from a man from Banu Asad, from Ali, who said: The Messenger of Allah (peace and blessings of Allah be upon him) said: "Four things: a man will not find the taste of faith until he believes in them: that there is no god but Allah alone, with no partner, and that I am the Messenger of Allah, whom He sent with the truth; and that he will die and be resurrected after death; and he believes in the Decree (Qadar), all of it."