1 Chronicles 15:29

And it came to pass, as the ark of the covenant of the LORD came to the city of David, that Michal the daughter of Saul looking out at a window saw king David dancing and playing: and she despised him in her heart.

Michal ... saw ... David dancing and playing. His movements would be slow and measured, suitable to the grave and solemn character of the music. Though his royal robes were laid aside, he was attired like the other officials, showing a becoming humility in the immediate presence of God. The feelings manifested by Michal were only an ebullition of spleen from a proud and passionate woman.