Al-Kāfi 2, narration 99

Translation

4. A number of our people have narrated from Ahmad ibn Muhammad ibn Khalid from Harun ibn al-Jahm or others from ‘Amr ibn Aban ibn al-Kalbi from ‘Abd al-Hamid al-Wasiti from abu Basir who has said the following: “Once Abu ‘Abdillah (a.s.) said to me, ‘O abu Muhammad, Islam is a high status.’ I said, ‘Yes, indeed it is.’ The Imam said, ‘Belief is above Islam by one degree.’ I said, ‘Yes, it is.’ The Imam said, ‘Piety is above belief by one degree.’ I said, ‘Yes, it is.’ The Imam said, ‘Certainty is above piety by one degree.’ I said, ‘Yes, it is.’ The Imam said, ‘Nothing is given to people as little as certainty is. What you are holding to is very little of Islam. Pay attention not to lose it.’”

Translation: Muhammad Sarwar — published with the edition, reproduced verbatim.