Sunan an-Nasa'i 3154

أَخْبَرَنَا مُحَمَّدُ بْنُ مَنْصُورٍ، قَالَ حَدَّثَنَا سُفْيَانُ، عَنْ عَمْرٍو، قَالَ سَمِعْتُ جَابِرًا، يَقُولُ قَالَ رَجُلٌ يَوْمَ أُحُدٍ أَرَأَيْتَ إِنْ قُتِلْتُ فِي سَبِيلِ اللَّهِ فَأَيْنَ أَنَا قَالَ ‏ "‏ فِي الْجَنَّةِ ‏"‏ ‏.‏ فَأَلْقَى تَمَرَاتٍ فِي يَدِهِ ثُمَّ قَاتَلَ حَتَّى قُتِلَ ‏.‏

It was narrated that 'Amr said:"I heard Jabir say: 'A man said on the day of Uhud: If I am killed in the cause of Allah, where do you think I will be? He said: In Paradise. He threw down some dates that were in his hand and fought until he was killed

Reference

Sunan an-Nasa'i 3154

In-book

Book 25, Hadith 70