Sayyiduna Awf bin Malik Ashja'i (may Allah be pleased with him) narrates that the Messenger of Allah (peace and blessings be upon him) said: No one tells stories to people except a leader, one who is appointed, or an arrogant person. In another narration, it is stated: No one delivers admonition except a leader, one who is appointed, or one who affects artificiality. Here, "telling stories" refers to giving admonition and advice. That is why the one who gives admonition and advice is called a "Qaas."