Esther 8:2

Took off his ring. The ring had, of course, been taken from Hainan and returned to Ahasuerus. This ring was a symbol of royal authority, and bore upon it the royal seal (see on ch. 3:10).

Set Mordecai. The possessions of Hainan had been forfeited to the crown and assigned to the custody of Esther (see on v. 1). She was not at liberty to give away what she had received in trust from the king and held by virtue of her position as queen. Thus Esther did not make Mordecai a gift of the house but set him over it. For all practical purposes this was equivalent to a gift. He was thus provided with a residence suitable to his new dignity as prime minister.