General Fiqh (Islamic Law)
There should separate from every division of them a group [remaining] to obtain understanding in the religion and warn their people when they return to them that they might be cautious.
(9:122 / Sahih International)
al-Rayyan ibn Shabeeb said: “I went to see Al-Ridha (as) on the first day of the (Arabic) month of Muharram. The Imam (as) said, ‘O Ibn Shabeeb! Are you fasting?’ I answered, ‘No.’ The Imam [...]