Daniel 6:8

6:8 Now let the king issue a written interdict so that it cannot be altered, according to the law of the Medes and Persians, which cannot be changed.

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so inclined, let a royal edict go forth from him, and let it be written in the laws of Persia and Media that cannot be repealed, that Vashti may not come into the presence of King Ahasuerus, and let the king convey her royalty to another who is more deserving than she.