Sahih Bukhari · Hadith 4096
Military Expeditions led by the Prophet (pbuh) (Al-Maghaazi) - كتاب المغازى
حدثنا عبد الله بن محمد، حدثنا سفيان، عن عمرو، سمع جابر بن عبد الله رضى الله عنهما قال قال رجل للنبي صلى الله عليه وسلم يوم أحد أرأيت إن قتلت فأين أنا قال " في الجنة " فألقى تمرات في يده، ثم قاتل حتى قتل.
Narrated Jabir bin `Abdullah: On the day of the battle of Uhud, a man came to the Prophet and said, "Can you tell me where I will be if I should get martyred?" The Prophet replied, "In Paradise." The man threw away some dates he was carrying in his hand, and fought till he was martyred .
Gradings are classical jarḥ-wa-taʿdīl, name-matched to a rijāl index (not individually re-verified).