Shaddad b. Aus reported God’s messenger as saying, “God who is blessed and exalted has decreed that everything should be done in a good way, so when you kill use a good method, and when you cut an animal’s throat you should use a good method, for each of you should sharpen his knife and give the animal as little pain as possible.” Muslim transmitted it.

وَعَنْ شَدَّادِ بْنِ أَوْسٍ عَنْ رَسُولِ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ قَالَ: «إِنَّ اللَّهَ تَبَارَكَ وَتَعَالَى كَتَبَ الْإِحْسَانَ عَلَى كُلِّ شَيْءٍ فَإِذَا قَتَلْتُمْ فَأَحْسِنُوا الْقِتْلَةَ وَإِذَا ذَبَحْتُمْ فَأَحْسِنُوا الذَّبْحَ وَلْيُحِدَّ أَحَدُكُمْ شَفْرَتَهُ وَلْيُرِحْ ذَبِيحَتَهُ» . رَوَاهُ مُسلم