"Whoever kills a man from among Ahl Adh-Dhimmah.[2] he will not smell the fragrance of Paradise, and its fragrance may be detected from a distance of seventy years." (Using translation from Nasāʾī 4749)  

عَنْ رَجُلٍ مِنْ أَصْحَابِ النَّبِيِّ ﷺ قَالَ قَالَ رَسُولُ اللهِ ﷺ مَنْ قَتَلَ رَجُلًا مِنْ أَهْلِ الذِّمَّةِ لَمْ يَجِدْ رِيحَ الْجَنَّةِ وَإِنَّ رِيحَهَا لَيُوجَدُ مِنْ مَسِيرَةِ سَبْعِينَ عَامًا