أَخْبَرَنَا مُحَمَّدُ بْنُ رَافِعٍ، قَالَ حَدَّثَنَا عَبْدُ الرَّزَّاقِ، قَالَ أَنْبَأَنَا مَعْمَرٌ، عَنْ أَيُّوبَ، عَنْ أَبِي قِلاَبَةَ، عَنْ أَبِي الأَشْعَثِ، عَنْ شَدَّادِ بْنِ أَوْسٍ، قَالَ سَمِعْتُ مِنَ النَّبِيِّ، صلى الله عليه وسلم اثْنَتَيْنِ فَقَالَ " إِنَّ اللَّهَ عَزَّ وَجَلَّ كَتَبَ الإِحْسَانَ عَلَى كُلِّ شَىْءٍ فَإِذَا قَتَلْتُمْ فَأَحْسِنُوا الْقِتْلَةَ وَإِذَا ذَبَحْتُمْ فَأَحْسِنُوا الذَّبْحَ وَلْيُحِدَّ أَحَدُكُمْ شَفْرَتَهُ ثُمَّ لِيُرِحْ ذَبِيحَتَهُ " .
It was narrated that Shadad bin Aws said: "I heard two things from the Messenger of Allah He said 'Allah, the Mighty and Sublime, ahs decreed proficiency in all things, so when you kill, kill well, and when you slaughter, slaughter well. Let one of you sharpen his blade and spear suffering to the animal he slaughter."" (Sahih ) Translation Not Available
Book Ref: Sunan An Nisai Book 43 Hadith 4413
Web Ref: Sunan An Nisai Vol 5 Book 43 Hadith 4418