It was narrated that Shaddad bin Aws said: “Two things that I memorized from the Messenger of Allah صلی اللہ علیہ وآلہ وسلم: ‘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)