Don't you know that it is forbidden (to strike the) face. He said: You see I was the seventh one amongst my brothers during the lifetime of Messenger of Allah ﷺ, and we had but only one servant. One of us got enraged and slapped him. Thereupon Messenger of Allah ﷺ commanded us to set him free.
لَقَدْ رَأَيْتُنِي وَإِنِّي لَسَابِعُ إِخْوَةٍ لِي مَعَ رَسُولِ اللَّهِ ﷺ وَمَا لَنَا خَادِمٌ غَيْرُ وَاحِدٍ فَعَمَدَ أَحَدُنَا فَلَطَمَهُ فَأَمَرَنَا رَسُولُ اللَّهِ ﷺ أَنْ نُعْتِقَهُ