What did the Prophet Muhammad (saw) say about the prayer of those who are penitent?
 Zaid b. Arqam, on seeing some people praying in the forenoon, said:                      They well know that prayer at another time than this is more excellent, for Allah's Messenger (may peace be upon him) said: The prayer of those who are penitent is observed when your weaned camels feel the heat of the sun.