There are two characteristics that I heard the Messenger of Allah ﷺ say: Allah has decreed that everything should be done in a good way, so when you kill use a good method. The version of the narrators other than Muslim says: "So kill in a good manner." And when you slaughter, you should use a good method, for one of you should sharpen his knife, and give the animal as little pain as possible. (Using translation from Abū Dāʾūd 2815)   

عَنِ النَّبِيِّ ﷺ قَالَ خَصْلَتَانِ سَمِعْتُهُمَا مِنَ النَّبِيِّ ﷺ قَالَ إِنَّ اللهَ كَتَبَ الْإِحْسَانَ عَلَى كُلِّ شَيْءٍ فَإِذَا قَتَلْتُمْ فَأَحْسِنُوا الْقِتْلَةَ وَإِذَا ذَبَحْتُمْ فَأَحْسِنُوا الذَّبْحَ وَلْيُحِدَّ أَحَدُكُمْ شَفْرَتَهُ وَلْيُرِحْ ذَبِيحَتَهُ لَفْظُ حَدِيثِ مُسْلِمِ بْنِ إِبْرَاهِيمَ  

[Machine] "From the Prophet, ﷺ : The most pardoning of people are the killers of the people of faith."  

عَنِ النَّبِيِّ ﷺ أَعَفُّ النَّاسِ قِتْلَةً أَهْلُ الْإِيمَانِ