Daniel 6:14-15

14Then, as soon as the king heard this statement, he was deeply 1distressed and set his mind on delivering Daniel; and even until sunset he kept exerting himself to rescue him. 15Then these men came 2by agreement to the king and said to the king, “Recognize, O king, that it is a 3law of the Medes and Persians that no injunction or statute which the king establishes may be changed.”