HOW TO SLAUGHTER AN ANIMAL H 644 "Allah has obligated perfection upon everything. When you have to kill someone do it in the best manner and the same applies when you slaughter an animal. Sharpen your knife and reduce its suffering." R 644 Muslim with a chain up to Shaddad, the son of Aus who related that the Prophet, praise and peace be upon him, said this.
639- وعن أَبي يعلى شَدَّاد بن أوسٍ رضي الله عنه ، عن رسول الله صلى الله عليه وآله وسلم ، قَالَ : "إنَّ الله كَتَبَ الإحْسَانَ عَلَى كُلِّ شَيْءٍ فَإذَا قَتَلْتُم فَأحْسِنُوا القِتْلَة ، وَإِذَا ذَبَحْتُمْ فَأحْسِنُوا الذِّبْحَةَ ، وَليُحِدَّ أَحَدُكُمْ شَفْرَتَه ، وَلْيُرِح ذَبِيحَتَهُ" رواه مسلم .