In a lengthy hadith, the Messenger of Allah ﷺ ordered Abd al-Rahman bin Awf to prepare himself for a military expedition over which the Prophet had appointed him as commander. The next morning, he came wearing a turban of black cotton cloth. The Prophet ﷺ called him over, untied the turban, then wrapped it around his head himself, letting four fingers' length or so hang down behind him.The Prophet then said, "This is how you should wear the turban, Ibn Awf. It is more proper and more becoming."He then ordered Bilal to hand him the banner. He praised Allah and said, "Go forth together to fight in the cause of Allah. Fight those who disbelieve in Allah. Do not steal from the spoils, do not act treacherously, do not mutilate the dead, and do not kill a child. This is the covenant of Allah and the practice of your Prophet among you."
- في حديث طويل- أن رسول الله ﷺ أمر عبد الرحمن بن عوف أن يتجهز لسرية أمره عليها، فأصبح قد اعتم بعمامة كرابيس سوداء، فدعاه النبي ﷺ، فنقضها، فعممه وأرسل من خلفه أربع أصابع أو نحوها، ثم قال: هكذا يا ابن عوف فاعتم، فإنه أعرف وأحسن، ثم أمر بلالا، أن يرفع إليه اللواء، فحمد الله، ثم قال: اغزوا جميعا في سبيل الله قاتلوا من كفر بالله، لا تغلوا، ولا تغدروا، ولا تمثلوا، ولا تقتلوا وليدا، فهذا عهد الله وسنة نبيكم فيكم.
Bazzar narrated it (6175), Tabarani in Awsat (4668), and Hakim (4/540), all of them through routes from Abu Jamahir Muhammad bin Uthman Dimashqi, who said, Haytham bin Humayd narrated to us, who said, Hafs bin Ghaylan narrated to me, from Ata bin Abu Rabah, and he mentioned it. Its chain is hasan because of Haytham bin Humayd and Hafs bin Ghaylan. Hakim said, "The chain is sahih." The hadith in full is mentioned in the book on jihad.