Humaid bin Abdur Rahman says that Sayyiduna Muawiyah bin Abi Sufyan (may Allah be pleased with him) delivered a sermon in Madinah Munawwarah and said: O people of Madinah! Where are your scholars? I have heard the Messenger of Allah (peace and blessings be upon him) say: This is the day of Ashura, fasting on this day has not been made obligatory upon us, so whoever among you wishes to fast on this day may do so, however, I am fasting. Then the people also fasted.