Whoever kills a mu‘āhad (a non-Muslim who is granted the pledge of protection by the Muslims) shall not smell the fragrance of Paradise, though its fragrance can be smelt at a distance of forty years

The Prophet (may Allah's peace and blessings be upon him) demonstrates the stern warning to anyone who kills a mu‘āhad - a non-Muslim who comes from the land of disbelievers to the abode of Islam and receives the pledge of protection and security - that he will not smell the fragrance of Paradise, though its fragrance can be smelt at a distance of forty years journey.