Messenger of Allah ﷺ (pointing to his broken canine tooth) said, "Allah's Wrath has become severe on the people who harmed His Prophet. Allah's Wrath has become severe on the man who is killed by the Apostle of Allah in Allah's Cause."  

قَالَ رَسُولُ اللَّهِ ﷺ اشْتَدَّ غَضَبُ اللَّهِ عَلَى قَوْمٍ فَعَلُوا بِنَبِيِّهِ يُشِيرُ إِلَى رَبَاعِيَتِهِ اشْتَدَّ غَضَبُ اللَّهِ عَلَى رَجُلٍ يَقْتُلُهُ رَسُولُ اللَّهِ ﷺ فِي سَبِيلِ اللَّهِ