Daniel 6:10, 15

Even after Daniel learned that the king had officially signed his decree, he continued his regular custom of praying at three set times a day. He went to the upper chamber of his house and opened the windows facing toward Jerusalem. Then he got down on his knees to pray, and he offered his grateful praise to God as he always had done.

But these powerful politicians went back to see the king and insisted, “Bear in mind, Your Majesty, that according to the law of the Medes and Persians, every edict or decree of the king is irrevocable.”