Messenger of Allah (ﷺ) said, "Faith in Allah and striving in His Cause (Jihad) are the deeds of highest merit." A man stood up said: "O Messenger of Allah! Tell me if I am killed in the Cause of Allah, will all my sins be forgiven?" He (ﷺ) replied, "Yes, if you are killed in the Cause of Allah while you are patient, hopeful of your reward and marching forward not retreating." Then the Prophet (ﷺ) said to him, "Repeat what you have said." The man said: "Tell me if I am killed in the Cause of Allah, will all my sins be remitted?". He replied, "Yes, if you are martyred while you are patient, hopeful of your reward and march forward without retreating, unless, if you owe any debt, that will not be remitted. Angel Jibril told me that".

[Muslim].