From Sahih Bukhari (Hadith 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
Reference: Bukhari 4046