Hadith: A man asked the Prophet (may Allah's peace and blessings be upon him) during the Battle of Uhud: "If I am killed, where do you think I would be?" He replied: "In Paradise." So the man threw some dates that were in his hand and fought until he was killed

عن جابر بن عبد الله رضي الله عنهما قال رجل للنبي صلى الله عليه وسلم يومَ أُحُدٍ: أَرَأَيْتَ إن قُتِلْتُ فَأَيْنَ أَنَا؟ قال: «في الجَنَّةِ» فأَلْقَى تَمراتٍ كُنَّ في يَدِه، ثم قاتل حتى قُتِلَ.
[صحيح] - [متفق عليه]

Jābir ibn ‘Abdullāh (may Allah be pleased with him) reported: A man asked the Prophet (may Allah's peace and blessings be upon him) during the Battle of Uhud: "If I am killed, where do you think I would be?" He replied: "In Paradise." So the man threw some dates that were in his hand and fought until he was killed.
[Authentic hadith] - [Narrated by Bukhari & Muslim]

Explanation

Jābir ibn ‘Abdullāh (may Allah be pleased with him) reported that a man called ‘Umayr ibn al-Humām asked the Prophet (may Allah's peace and blessings be upon him) during the Battle of Uhud: O Messenger of Allah, tell me: If I fought until I was killed (meaning, if I fought the polytheists and got killed during this battle), what would my final destination be? The Prophet (may Allah's peace and blessings be upon him) replied that he would be in Paradise. Upon hearing that, the man threw down some dates that were in his hand and said: "It will be such a long life if I wait until I eat these dates." Then he went forward and fought until he was killed (may Allah be pleased with him).