Narrated `Abdullah bin `Amr: The Prophet said, "Whoever killed a person having a treaty with the Muslims, shall not smell the smell of Paradise though its smell is perceived from a distance of forty years."
Hadith ReferenceSahih Bukhari / The Book of Al-Jizya and The Stoppage of War / Hadith: 3166
Hadith Gradingمحدثین:أحاديث صحيح البخاريّ كلّها صحيحة