(30) باب إِثْمِ مَنْ قَتَلَ ذِمِّيًّا بِغَيْرِ جُرْمٍ
Narrated `Abdullah bin `Amr:
The Prophet (ﷺ) said, "Whoever killed a Mu'ahid (a person 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 (of traveling).
Reference: Sahih al-Bukhari 6914
In-book reference: Book 87, Hadith 52
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 9, Book 83, Hadith 49