Khabab bin Arat reported,

We migrated with the Messenger of Allah ﷺ seeking the face of Allah, so our reward became due upon Allah. Some of us passed away without having taken anything from their reward in this world. Among them was Musab bin Umayr, who was killed on the day of Uhud. He left behind nothing but a striped cloak. When we covered his head with it, his feet would stick out, and when we covered his feet with it, his head would stick out. So the Prophet ﷺ said to us, "Cover his head with it and place idhkhir grass over his feet," or he said, "Place some idhkhir over his feet." And among us are those whose fruit has ripened, and they are now harvesting it.

Bukhari 4047

Sahih

حدثنا أحمد بن يونس حدثنا زهير حدثنا الأعمش عن شقيق

عن خباب بن الأرت رضي الله عنه قال

هاجرنا مع رسول الله ﷺ نبتغي وجه الله فوجب أجرنا على الله ومنا من مضى أو ذهب لم يأكل من أجره شيئا كان منهم مصعب بن عمير قتل يوم أحد لم يترك إلا نمرة كنا إذا غطينا بها رأسه خرجت رجلاه وإذا غطي بها رجلاه خرج رأسه فقال لنا النبي ﷺ غطوا بها رأسه واجعلوا على رجله الإذخر أو قال ألقوا على رجله من الإذخر ومنا من قد أينعت له ثمرته فهو يهدبها

البخاري 4047صحيح
Contents
Reference
Commentary
Ayat
Collection
Sahih Bukhari
Book
Expeditions
Chapter
Uhud expedition
Numbering
Darussalam 4047
Bukhari 4047