Hammad bin Salama حماد بن سلمة · The Book of Fighting [The Prohibition of Bloodshed]

"Jundab said: 'So and so told me that the Messenger of Allah said: The slain will bring his killer on the Day of Resurrection and will say: Ask him why he killed me. He will say: I killed him defending the kingdom of so and so.'" Jundab said: "So be careful.'"

"The Messenger of Allah said: 'Whoever is killed defending his wealth and is killed unjustly, he is a martyr.'"

The Messenger of Allah said: "Do not revert to disbelievers after I am gone." It is Mursal.