Daniel 1:19-20

1:19 When the king spoke with them, he did not find among the entire group anyone like Daniel, Hananiah, Mishael, or Azariah. So they entered the king’s service. 1:20 In every matter of wisdom and insight the king asked them about, he found them to be ten times better than any of the magicians and astrologers that were in his entire empire.

Daniel 6:12

6:12 So they approached the king and said to him, “Did you not issue an edict to the effect that for the next thirty days anyone who prays to any god or human other than to you, O king, would be thrown into a den of lions?” The king replied, “That is correct, according to the law of the Medes and Persians, which cannot be changed.”