Al-Khabbab bin Al-Aratt (May Allah be pleased with him) reported:
We emigrated with Messenger of Allah ﷺ seeking the pleasure of Allah and expecting our reward from Him. Some of us died without enjoying anything of it. Among them was Mus'ab bin 'Umair (May Allah be pleased with him), who was killed in the battle of Uhud, leaving only a small coloured sheet of wool (which we used as his shroud). When we covered his head with it, his feet were exposed, and when we covered his feet with it, his head was uncovered. So the Prophet ﷺ told us to cover his head and to put some Idhkhir (i.e., fragrant grass) over his feet. Others among us enjoy prosperity.

[Al-Bukhari and Muslim].

وعن خباب بن الأرت، رضي الله عنه، قال: هاجرنا مع رسول الله ﷺ نلتمس وجه الله تعالى؛ فوقع أجرنا على الله، فمنا من مات ولم يأكل من أجره شيئا، منهم مصعب بن عمير، رضي الله عنه، قتل يوم أحد، وترك نمرة، فكنا إذا غطينا بها رأسه، بدت رجلاه، وإذا غطينا به رجليه، بدا رأسه، فأمرنا رسول الله ﷺ أن نغطى رأسه، ونجعل على رجليه شيئاً من الإذخر، ومنا من أينعت له ثمرته، فهو يهديها. ((متفق عليه)). النمرة : كساء ملون من صوف. وقوله: أينعت أي: نضجت وأدركت. وقوله يهديها وهو بفتح الياء وضم الدال وكسرها، لغتان؛ أي: يقطفها ويجتنيها، وهذه استعارة لما فتح الله تعالى عليهم من الدنيا وتمكنوا فيها.