Humaid bin Abdur Rahman narrates that I heard Sayyiduna Muawiyah bin Abi Sufyan (may Allah be pleased with him) on the day of Ashura during Hajj, delivering a sermon from the pulpit. He said: O people of Madinah, where have your scholars gone? I heard the Messenger of Allah (peace and blessings be upon him) say: This is the day of Ashura; its fasting is not obligatory upon you, but I am fasting, so whoever wishes may fast (and act upon my Sunnah), and whoever wishes may not fast.