Daniel 6:8

6:8 Now, O king, establish the decree, and sign the writing, that it be not changed, according to the law of the Medes and Persians, which altereth not.

Daniel 6:14-15

6:14 Then the king, when he heard [these] words, was sore displeased with himself, and set [his] heart on Daniel to deliver him: and he laboured till the going down of the sun to deliver him. 6:15 Then these men assembled unto the king, and said unto the king, Know, O king, that the law of the Medes and Persians [is], That no decree nor statute which the king establisheth may be changed.

Daniel 6:18

6:18 Then the king went to his palace, and passed the night fasting: neither were instruments of musick brought before him: and his sleep went from him.

Daniel 6:27

6:27 He delivereth and rescueth, and he worketh signs and wonders in heaven and in earth, who hath delivered Daniel from the power of the lions.