Abdah bin Sulaiman al-Klabi عبدة بن سليمان الكلابي أبو محمد الكوفي · The Book of ad-Dahaya (Sacrifices)

"I heard the Messenger of Allah say: 'Allah, the Mighty and Sublime, has decreed proficiency in all things, so when you kill, kill well, and when you slaughter, slaughter well. Let one of you sharpen his blade and spare suffering to the animal he slaughters" (Sahih)