Hazrat Saeed bin Musayyib (may Allah have mercy on him) says that once I said to Sayyiduna Sa’d bin Abi Waqqas (may Allah be pleased with him) that I want to ask you about a hadith, but I feel afraid to ask you. He replied: Nephew! Do not do that. When you know that I have knowledge of something, then ask me freely and do not be afraid. I asked: When the Prophet (peace and blessings be upon him) left Sayyiduna Ali (may Allah be pleased with him) in Madinah Munawwarah as his deputy on the occasion of the Battle of Tabuk, what did he say to him? Sayyiduna Sa’d (may Allah be pleased with him) replied: When the Prophet (peace and blessings be upon him) appointed Sayyiduna Ali (may Allah be pleased with him) as his deputy in Madinah Munawwarah on the occasion of the Battle of Tabuk and left him there, he (Ali) said: O Messenger of Allah! Will you leave me among children and women? The Prophet (peace and blessings be upon him) said:“Are you not pleased that your relation to me is the same as that of Harun (peace be upon him) to Musa (peace be upon him) — except for Prophethood?”He (Ali) said: Why not, O Messenger of Allah! Upon this, Sayyiduna Ali (may Allah be pleased with him) quickly returned, and even today I feel the dust rising from his footsteps before my eyes.