Sahih Muslim , Book 32, Hadith 6322 (USC-MSA) ⓘ
This hadith has been transmitted on the authority of Abu Zinad and he said: " When one amongst you strikes (at the face)."
حَدَّثَنَا عَمْرٌو النَّاقِدُ، وَزُهَيْرُ بْنُ حَرْبٍ، قَالاَ حَدَّثَنَا سُفْيَانُ بْنُ عُيَيْنَةَ، عَنْ أَبِي الزِّنَادِ، بِهَذَا الإِسْنَادِ وَقَالَ " إِذَا ضَرَبَ أَحَدُكُمْ " .
also referenced under: Book 45, Hadith 149 (In-Book) & Hadith 2612 (Reference)