14As soon as the king heard this, he was deeply distressed and set his mind on delivering Daniel, and he labored until sundown to rescue him.
15Then the men approached the king together and said to him, “Remember, O king, that by the law of the Medes and Persians no decree or ordinance established by the king can be changed.”
16So the king gave the order, and they brought Daniel and threw him into the den of lions. The king said to Daniel, “May your God, whom you serve continually, deliver you!”
17A stone was brought and placed over the mouth of the den, and the king sealed it with his own signet ring and with the rings of his nobles, so that nothing concerning Daniel could be changed.
— Daniel 6:14-17