Esther 1:19

1:19 If the king is so inclined, let a royal edict go forth from him, and let it be written in the laws of Persia and Media that cannot be repealed, that Vashti may not come into the presence of King Ahasuerus, and let the king convey her royalty to another who is more deserving than she.

Esther 8:8

8:8 Now you write in the king’s name whatever in your opinion is appropriate concerning the Jews and seal it with the king’s signet ring. Any decree that is written in the king’s name and sealed with the king’s signet ring cannot be rescinded.