´It was narrated that Shaddad bin Aws said:` "There are two things that I memorized from the Messenger of Allah, who said: 'Allah 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)
Hadith Referenceسنن نسائي / كتاب الضحايا / 4410
Hadith Gradingالألبانی:صحيح | زبیر علی زئی:صحيح مسلم