Jami` at-Tirmidhi, Book 16, Hadith 25 (In-Book) ⓘ
Narrated Shaddad bin Aws: that the Prophet 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)."
حَدَّثَنَا أَحْمَدُ بْنُ مَنِيعٍ، حَدَّثَنَا هُشَيْمٌ، حَدَّثَنَا خَالِدٌ، عَنْ أَبِي قِلاَبَةَ، عَنْ أَبِي الأَشْعَثِ الصَّنْعَانِيِّ، عَنْ شَدَّادِ بْنِ أَوْسٍ، أَنَّ النَّبِيَّ صلى الله عليه وسلم 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 .
also referenced under: Hadith 1409 (Reference) & Volume 3, Book 14, Hadith 1409 (DarusSalam)