Abdullah bin Abu Qatada reported,
Abu Qatada reported that he heard him narrate from the Messenger of Allah ﷺ that he stood among them and mentioned that jihad in the path of Allah and faith in Allah are the best of deeds.A man stood up and asked, "Messenger of Allah, tell me, if I am killed in the path of Allah, will my sins be forgiven?"The Messenger of Allah ﷺ answered him, "Yes, if you are killed in the path of Allah while patient, seeking reward, advancing and not retreating."Then the Messenger of Allah ﷺ asked, "What did you say?"The man repeated, "Tell me, if I am killed in the path of Allah, will my sins be forgiven?"The Messenger of Allah ﷺ replied, "Yes, while you are patient, seeking reward, advancing and not retreating, except for debt, for Jibreel 
told me that."
Azami 5601
Sahihعن عبد الله بن أبي قتادة
عن أبي قتادة أنه سمعه يحدث عن رسول الله ﷺ: أنه قام فيهم، فذكر لهم: أن الجهاد في سبيل الله والإيمان بالله أفضل الأعمال. فقام رجل، فقال: يا رسول الله، أرأيت إن قتلت في سبيل الله تكفر عنى خطاياي؟ فقال له رسول الله ﷺ: نعم، إن قتلت في سبيل الله وأنت صابر محتسب مقبل غير مدبر. ثم قال رسول الله ﷺ: كيف قلت؟ قال: أرأيت إن قتلت في سبيل الله أتكفر عني خطاياي؟ فقال رسول الله ﷺ: نعم، وأنت صابر محتسب مقبل غير مدبر إلا الدين، فإن جبريل- عليه السلام- قال لي ذلك.
Muslim narrated it in the Book of Leadership (1885) from Qutayba bin Saeed, who said, Layth narrated to us, from Saeed bin Abu Saeed, from Abdullah bin Abu Qatada, and he mentioned it. Yahya bin Saeed likewise narrated it from Saeed bin Abu Saeed Maqburi with his chain, similar to the hadith of Layth. Malik narrated it through this same route in Muwatta (2/461) from Yahya bin Saeed.Daraqutni said in Ilal (6/134), "The statement of the one who said, from Malik, from Yahya bin Saeed, from Maqburi, is more sahih. He said, Layth narrated it from Saad (this is how it appears, though the correct form is Saeed), and Ibn Abu Dhib narrated it from Saeed Maqburi, from Abdullah bin Abu Qatada, from his father." Then he said, "The correct view is the view of the one who narrated it from Yahya bin Saeed, from Maqburi, from Ibn Abu Qatada, from his father, since this is supported by Layth and Ibn Abu Dhib, who both narrated from Maqburi in this same manner." End of quote.