Sunan an-Nasa'i 4750
سنن النسائي#4750SahihIt was narrated that 'Abdullah bin 'Amr said:"The Messenger of Allah said: 'Whoever kills a person from among Ahl Adh-Dhimmah, he will not smell the fragrance of Paradise, and its fragrance may be detected from a distance of forty years
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Abu GhuddahSahih
Al-AlbaniSahih
Zubair Ali ZaiIsnaad Sahih
In-book reference: 45:45