On the day of the battle of Uhud, a man came to the Prophet (ﷺ) and said, "Can you tell me where I will be if I should get martyred?" The Prophet (ﷺ) replied, "In Paradise." The man threw away some dates he was carrying in his hand, and fought till he was martyred .
Sahih al-Bukhari Book 64, Hadith 92
← Previous Hadith A meal was brought to `Abdur-Rahman bin `Auf while he was fasting. He said, "Mus`ab bin `Umar was martyred, and he was better than I, yet he was shrouded in a Burda (i.e. a sheet) so that, if his head was covered, his feet became naked, and if his feet were covered, his head became naked." `Abdur-Rahman added, "Hamza was martyred and he was better than 1. Then worldly wealth was bestowed upon us and we were given thereof too much. We are afraid that the reward of our deeds have been given to us in this life." `Abdur-Rahman then started weeping so much that he left the food.

Sahih al-Bukhari Book 64, Hadith 91 Next Hadith → We migrated in the company of Allah's Messenger (ﷺ), seeking Allah's Pleasure. So our reward became due and sure with Allah. Some of us have been dead without enjoying anything of their rewards (here), and one of them was Mus'ab bin 'Umar who was martyred on the day of the battle of Uhud, and did not leave anything except a Namira (i.e. a sheet in which he was shrouded). If we covered his head with it, his feet became naked, and if we covered his feet with it, his head became naked. So the Prophet (ﷺ) said to us, "Cover his head with it and put some Idhkhir (i.e. a kind of grass) over his feet or throw Idhkhir over his feet." But some amongst us have got the fruits of their labor ripened, and they are collecting them.

Sahih al-Bukhari Book 64, Hadith 93