Esther 5:6

And the king said to Esther on the second day also as they drank their wine at the feast, “What is your petition, Queen Esther? It shall be given you. And what is your request? Even to half of the kingdom it shall be done.”

So the king said to Queen Esther, “The Jews have killed and caused to perish 500 men and the 10 sons of Haman at the citadel in Susa. Now in the rest of the king’s provinces, what have they done? So what is your petition? It shall even be given to you. And what is your further request? It shall also be done.”

And he swore to her, “Whatever you ask of me, I will give it to you; up to half of my kingdom.”