“Imam al-Ghazzali in his book “al-Arba’in fi Usul al-Deen” has enumerated ten forms which worship can take:

1. Prayers.
2. Prescribed Alms-giving.
3. Fasting.
4. Haji or pilgrimage to Makkah.
5. Reciting the Holy Qur’an.
6. Remembrance of Allah in all possible situations.
7. Earning one’s livelihood in accordance with the regulations of the Shari’ah
8. Fulfilling one’s obligations towards one’s companions and [...]