It has been narrated on the authority of Abu Huraira that the Messenger of Allah (ﷺ) said: Do not desire an encounter with the enemy; but when you encounter them, be firm.
It is narrated by Abu Nadr that he learnt from a letter sent by a man from the Aslam tribe, who was a Companion of the Prophet (ﷺ) and whose name was 'Abdullah b. Abu Aufa, to 'Umar b. 'Ubaidullah when the latter marched…