Sayyiduna Muhammad bin Abdullah bin Jahsh (may Allah be pleased with him) narrates that a man came to the Messenger of Allah (peace and blessings be upon him) and said: O Messenger of Allah! What is your view if I fight in the path of Allah until I am killed? He (peace and blessings be upon him) said: "Paradise." Then, when the man turned away, he (peace and blessings be upon him) said: "Bring him back to me." When he came, he (peace and blessings be upon him) said: "Jibril (peace be upon him) has said: 'Unless he has a debt upon him.'"
Hadith Referenceالمعجم الكبير للطبراني / باب الميم / 16607