Sayyiduna Ibn Abbas (may Allah be pleased with them both) said: A man came to the Messenger of Allah (peace and blessings be upon him) and said: O Messenger of Allah, (if) a man fights in the path of Allah seeking reward until he is killed, will he enter Paradise? He (peace and blessings be upon him) said: "Yes." When he turned his back to leave, he (peace and blessings be upon him) called him back and said: "Jibril (peace be upon him) came to me and said: Provided he has no debt upon him."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 11151