John Gill Commentary Daniel 6:12

"Then they came near, and spake before the king concerning the king`s interdict: Hast thou not signed an interdict, that every man that shall make petition unto any god or man within thirty days, save unto thee, O king, shall be cast into the den of lions? The king answered and said, The thing is true, according to the law of the Medes and Persians, which altereth not." — Daniel 6:12 (ASV)

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 spoke 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.

Have you not signed a decree, that every man that shall ask a petition of any god or man within thirty days, save of you, 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 alters 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.