Daniel 6:13

11Then these men assembled together, and found Daniel making petition and supplication before his God.

12Then they came near, and spoke before the king concerning the king’s decree: “Haven’t you signed a decree that every man who makes a petition to any god or man within thirty days, except to you, O king, shall be cast into the den of lions?” The king answered, “This thing is true, according to the law of the Medes and Persians, which doesn’t alter.”

13Then they answered and said before the king, “That Daniel, who is of the children of the captivity of Judah, doesn’t respect you, O king, nor the decree that you have signed, but makes his petition three times a day.”

14Then the king, when he heard these words, was very displeased, and set his heart on Daniel to deliver him; and he labored until the going down of the sun to rescue him.

15Then these men assembled together to the king, and said to the king, “Know, O king, that it is a law of the Medes and Persians, that no decree nor statute which the king establishes may be changed.”