What are the five roots of 'Usal ad-din?
1. Belief in Oneness and Unity of Allah (Al - Tawhid)
2. Belief in Divine Justice (Al-Adl)
[God is just - does not commit any injustice]
3. Belief in Prophethood: Al - Nubuwah
4. Belief in Imams (Al - Imamah)
5. Belief in Day of Resurrection and Judgement (Mi'ad)
[After death humans will be resurrected to be judged]