"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." (Using translation from Nasāʾī 4750)
قَالَ رَسُولُ اللهِ ﷺ مَنْ قَتَلَ قَتِيلًا مِنْ أَهْلِ الذِّمَّةِ لَمْ يَرَحْ رَائِحَةَ الْجَنَّةِ وَإِنَّ رِيحَهَا لَيُوجَدُ مِنْ مَسِيرَةِ أَرْبَعِينَ عَامًا