The imam should encourage the leader of a delegation to fear Allah, and also teach him what he needs [to know] concerning matters of fighting the enemy and entering into pacts with them

WE RELATE FROM the Ṣaḥīḥ of Muslim from Buraydah who reported that whenever the Messenger of Allah appointed a leader of an army or expedition he advised him to have fear of Allah and to treat those Muslims who were with him well. Then he said: “Strive in the Way of Allah and in the Name of Allah. Do battle with those who reject Allah. Attack but do not be malicious, do not deceive, do not mutilate, and do not kill children. And when you meet your enemy, if they are idolaters, invite them to do three things.” ^[1].He then quoted the rest of the hadith.