"O Messenger of Allah, if I am killed in the cause of Allah, will Allah forgive my sins?" The Messenger of Allah (ﷺ) said: "Yes, if you are killed in the cause of Allah, and you are patient and seek reward, and you are facing the enemy, not running way - except for debt. Jibril (peace be upon him) told me that."
Sunan an-Nasa'i Book 25, Hadith 73
← Previous Hadith "A man came to the Messenger of Allah (ﷺ) and said: 'O Messenger of Allah, if I am killed in the cause of Allah with patience and seeking reward, facing the enemy and not running away, do you think that Allah will forgive my sins?' The Messenger of Allah (ﷺ) said: 'Yes.' When the man turned away, the Messenger of Allah (ﷺ) called him back and said: 'What did you say?' He repeated his question, and the Messenger of Allah (ﷺ) said: 'Yes, except debt. Jibril told me.'"

Sunan an-Nasa'i Book 25, Hadith 72 Next Hadith → "A man came to the Prophet (ﷺ) when he was on the Minbar and said: 'O Messenger of Allah, do you think that if I wield this sword of mine in the cause of Allah, with patience and seeking reward, facing the enemy, and not running away, will Allah forgive my sins?' He said: 'Yes.' When he turned away, he called him back and said: 'Jibril says: unless you are in debt.'"

Sunan an-Nasa'i Book 25, Hadith 74