A man said to az-Zubair: “Shall I kill ʿAli for you?” He said: “How would you kill him?” He said: “I will assassinate him.”He said: “No, the Messenger of Allah ﷺ said: Faith prohibits assassination; no believer should resort to that.ʿ
رَجُلٌ لِلزُّبَيْرِ أَلا أَقْتُلُ لَكَ عَلِيًّا؟ قَالَ كَيْفَ تَقْتُلُهُ؟ قَالَ أَفْتِكُ بِهِ قَالَ لَا قَالَ رَسُولُ اللهِ ﷺ الْإِيمَانُ قَيَّدَ الْفَتْكَ لَا يَفْتِكُ مُؤْمِنٌ