Sayyiduna Shaddad bin Aws (may Allah be pleased with him) narrates: I have memorized two things from the words of the Prophet (peace and blessings of Allah be upon him): (He said:) "Indeed, Allah has prescribed excellence in everything. So when you kill, kill in a good manner, and when you slaughter, slaughter in a good manner. You should sharpen your knife and give comfort to your sacrificial animal."