Sayyiduna Sufyan bin Abdullah (may Allah be pleased with him) said: I asked, "O Messenger of Allah! Tell me something which I may hold fast to." The Prophet (peace and blessings be upon him) said: "Say: Allah is my Lord, then remain steadfast upon it." Then I asked, "O Messenger of Allah! What do you fear most for me?" Sayyiduna Sufyan (may Allah be pleased with him) said: The Prophet (peace and blessings be upon him) took hold of his blessed tongue and said: "This."