عَنْ عَلِيٍّ رَضِيَ اللَّهُ عَنْهُ عَنِ النَّبِيِّ صَلَّى اللَّهُ عَلَيْهِ وَآلِهِ وَسَلَّمَ قَالَ الْمُؤْمِنُونَ تَتَكَافَأُ دِمَاؤُهُمْ وَيَسْعَى بِذِمَّتِهِمْ أَدْنَاهُمْ وَهُمْ يَدٌ عَلَى مَنْ سِوَاهُمْ أَلَا لَا يُقْتَلُ مُؤْمِنٌ بِكَافِرٍ وَلَا ذُو عَهْدٍ فِي عَهْدِهِ
Sayyiduna Ali (may Allah be pleased with him) narrates that the Noble Prophet (peace and blessings be upon him) said: The blood of all believers is equal; even the lowest-ranking believer can grant protection. They are all like one hand against those outside their community. Beware! A believer will not be killed in retaliation for a disbeliever, nor will a dhimmi be killed during the period of his covenant.