2 Samuel 6:16

And as the ark of the Lord came into the city of David
Being brought thither on the shoulders of the Levites:

Michal, Saul's daughter, looked through a window;
in the king's palace, to see the procession, which was very grand, and in great pomp, attended by a vast number of people, and with music of all sorts. She is said to be Saul's daughter, though David's wife, as having a good deal of her father's haughty temper and disposition, as appears by what follows:

and saw King David leaping and dancing before the Lord;
the ark of the Lord, by these outward gestures expressing the inward joy of his heart on this occasion;

and she despised him in her heart;
as acting a mean part, quite beneath himself, and unbecoming his royal dignity.