Imam Ja‘far al-Ṣadiq (as): I asked Imam al-Sadiq (as) about faith. He said: It is testifying that there is no god but Allah, attesting to whatever has come from Allah and the certification which has settled in the heart. I said: Is not testimony a kind of action? He said: yes. I said: Can an action be a part of faith? He said: Yes, Faith cannot exist without action, and action stems from faith, and faith will not be rooted in the heart unless through action. al-Kāfī