Sahih al-Bukhari 4046
Narrated Jabir bin `Abdullah:
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 .
حَدَّثَنَا عَبْدُ اللَّهِ بْنُ مُحَمَّدٍ، حَدَّثَنَا سُفْيَانُ، عَنْ عَمْرٍو، سَمِعَ جَابِرَ بْنَ عَبْدِ اللَّهِ ـ رضى الله عنهما ـ قَالَ قَالَ رَجُلٌ لِلنَّبِيِّ صلى الله عليه وسلم يَوْمَ أُحُدٍ أَرَأَيْتَ إِنْ قُتِلْتُ فَأَيْنَ أَنَا قَالَ ‏
"‏ فِي الْجَنَّةِ ‏"‏ فَأَلْقَى تَمَرَاتٍ فِي يَدِهِ، ثُمَّ قَاتَلَ حَتَّى قُتِلَ‏.‏