that the Prophet ﷺ said: "Indeed Allah has decreed Ihsan in everything. So when you kill, then do the killing well, and when you slaughter, then do the slaughtering well. Let one of you sharpen his blade, and let him comfort his animal (before slaughtering)."
أَنَّ النَّبِيَّ ﷺ قَالَ إِنَّ اللَّهَ كَتَبَ الإِحْسَانَ عَلَى كُلِّ شَيْءٍ فَإِذَا قَتَلْتُمْ فَأَحْسِنُوا الْقِتْلَةَ وَإِذَا ذَبَحْتُمْ فَأَحْسِنُوا الذِّبْحَةَ وَلْيُحِدَّ أَحَدُكُمْ شَفْرَتَهُ وَلْيُرِحْ ذَبِيحَتَهُ قَالَ هَذَا حَدِيثٌ حَسَنٌ صَحِيحٌ أَبُو الأَشْعَثِ الصَّنْعَانِيُّ اسْمُهُ شُرَحْبِيلُ بْنُ آدَةَ