Rabbi José said: It was the universal custom of the kings of Media when they were eating and drinking to cause their women to come before them stark naked, playing and dancing, in order to see the beauty of their figures. When the wine entered the heart of Ahasuerus, he wished to act in this manner with Vashti the queen. She was the daughter of a king, and she was not willing to do this. He decreed concerning her, and she was slain.
When the wine had passed from the heart of Ahasuerus, he sought after Vashti, but he did not find her. They told him of the deed which had been done, and (also) of the decree which had been ordained concerning her. Why was the decree passed against her? Because she used to make the daughters of Israel come and toil for her on Sabbaths, therefore was the decree ordained against her that she should be slain naked on the Sabbath, as it is said, "He remembered Vashti, and what she had done, and what was decreed against her" (Esth. 2:1).