Has anyone heard this story? Muawiyah became a khotib and during khutbah he remembered that he hadn't done the wudhu yet. He was confused, but soon he got a great idea. He ordered a man in the front line (shaf) to take some water and he gave tutorial of wudhu (ablution) in the khutbah and at the same time he took his own wudhu.

Is it authentic story?