Jabir (May Allah be pleased with him) reported:
A man asked the Messenger of Allah ﷺ: "Tell me where I will be if I am killed while fighting in the way of Allah?" He ﷺ replied, "In Jannah." The man threw away the few dates which he had in his hand, jumped into the battlefield and fought on till he was killed.

[Muslim].

وعن جابر رضي الله عنه قال: قال رجل: أين أنا يا رسول الله إن قتلت؟ قال: “في الجنة" فألقى تمرات كن في يده ثم قاتل حتى قتل" ((رواه مسلم)).