Bible Verses About Medo-Persian Kingdom: Laws of, unalterable

And they came and spoke to the king concerning the edict: O king, hast thou not decreed, that every man that should make a request to any of the gods, or men, for thirty days, but to thyself, O king, should be cast into the den of the lions? And the king answered them, saying: The word is true, according to the decree of the Medes and Persians, which it is not lawful to violate.

But those men perceiving the king's design, said to him: Know thou, O king, that the law of the Medes and Persians is, that no decree which the king hath made, may be altered.