Musnad Abu Ya'la al-Mawsili 6:20

Sa'd ibn Abi Waqqas said to a man, "There is no Jumu'ah for you." The Prophet (peace and blessings of Allah be upon him) said, "Why, O Sa'd?" He said, "Because he was speaking while you were delivering the khutbah." The Prophet (peace and blessings of Allah be upon him) said, "Sa'd has spoken the truth."