Abu Ya'la Shaddad bin 'Aus (May Allah be pleased with him) reported:
Messenger of Allah ﷺ said, "Verily Allah has prescribed Ihsan (kindness) for everything. So when you kill, you must make the killing in the best manner; when you slaughter, make your slaughter in the best manner. Let one of you sharpen his knife and give ease to his animal (in order to reduce his pain)."

[Muslim].

وعن أبى يعلى شداد بن أوس رضي الله عنه، عن رسول الله ﷺ قال: “إن الله كتب الإحسان على كل شئ، فإذا قتلتم فأحسنوا القتلة وإذا ذبحتم فأحسنوا الذبحة، وليحد أحدكم شفرته وليرح ذبيحته” ((رواه مسلم)).