The master of Luqman -when he was a servant- called for him and said to him: "Slaughter an ewe and bring me the two best parts of it." He slaughtered it and brought him the heart and the tongue. After a few days his master ordered him to slaughter an ewe and to bring him the two most wicked parts of it. He did and he also brought him the heart and the tongue. His master wondered and asked him about that. Luqman said: "If the heart and tongue were pure, they are better than everything. When they are wicked, they are more wicked than everything."