Daniel 6:12

Then they came near
They went immediately from Daniel's house to the king's palace, and into the king's presence; which they could do, either by virtue of their offices, or being admitted by the proper officer in waiting: and spake before the king concerning the king's decree;
at first they said nothing about Daniel, but about the decree, to get it recognized, and afresh ratified and confirmed; lest, under some pretence or another, the king should change it: hast thou not signed a decree, that every man that shall ask a petition
of any god or man within thirty days, save of thee, O king, shall be
cast into the den of lions?
they do not say peremptorily that he had signed such a decree, but put the question to him, that they might have it affirmed by himself: the king answered and said, the thing is true, according to the law of
the Medes and Persians, which altereth not;
it is true that such a decree is made and signed, and it is an unalterable one; such as is every established and signed decree of the Medes and Persians: it is as if he had said, it is very true what you put me in mind of, and I will never recede from it, or nullify and make it void.