The Forty Hadith of Imam Nawawi Allah has prescribed excellence (ihsan) in all things Abu Ya'la Shaddad ibn Aws Sahih Verily Allah has prescribed ihsan (proficiency, perfection) in all things. So if you kill then kill well; and if you slaughter, then slaughter well. Let each one of you sharpen his blade and let him spare suffering to the animal he slaughters. https://parallelquran.com/hadith/forty-nawawi-17/