Daniel 6:12 TLB

[12] They rushed back to the king and reminded him about his law. "Haven't you signed a decree," they demanded, "that permits no petitions to any God or man-except you-for thirty days? And anyone disobeying will be thrown to the lions?" "Yes," the king replied, "it is 'a law of the Medes and Persians,' that cannot be altered or revoked."