'Angel' in the Bible

"Blessed be the God of Shadrach, Meshach and Abednego! He sent his angel to deliver his servants who trusted in him. They disobeyed the king's command and were willing to risk their lives in order not to serve or worship any god except their own God. So I decree that people from any nation or language who say anything against the God of Shadrach, Meshach and Abednego will be destroyed and their house reduced to rubble, because there is no other god who can save like this."

My God sent his angel and sealed the mouths of the lions. They have not harmed me, proving that I'm innocent before him. Also against you, your majesty, I've committed no offense."