Musnad Ahmad 763:1

Muhammad ibn Bishr narrated to us, Muhammad ibn ‘Amr narrated to us, Abu Kathir, the freed slave of the Laythites, informed us, from Muhammad ibn ‘Abdullah ibn Jahsh, that a man came to the Prophet, may Allah bless him and grant him peace, and said: "What is for me, O Messenger of Allah, if I am killed in the way of Allah?" He said: "Paradise." He said: Then, when he turned away, he said: "Except for debt; Jibril, peace be upon him, whispered it to me just now."