two are the things which I remember Messenger of Allah ﷺ having said: "Verily Allah has enjoined excellence to everything; so when you kill, kill in a good way and when you slaughter, slaughter in a good way. So every one of you should sharpen his knife, and let the slaughtered animal die comfortably." (Using translation from Muslim 1955a)
"إِن الله ﷻ مُحْسنٌ يحب الإِحسان فإِذا قتلتم فأَحسنوا القِتْلة وإِذا ذبحتم فأَحسنوا الذَّبْحَ، ولْيُحِدَّ أَحَدُكُم شَفْرَتَه، ثم ليُرِحْ ذَبِيحَتَه".