'Angel' in the Bible

Then thy handmaid said, Let, I pray thee, the word of my lord the king be comfortable; for as an angel of God, so is my lord the king to discern good and bad: and Jehovah thy God be with thee.

to change the face of the matter hath thy servant Joab done this thing: and my lord is wise, according to the wisdom of an angel of God, to know all things that are in the earth.

And he hath slandered thy servant unto my lord the king; but my lord the king is as an angel of God: do therefore what is good in thine eyes.

And when the angel stretched out his hand toward Jerusalem to destroy it, Jehovah repented him of the evil, and said to the angel that destroyed the people, It is enough; now stay thy hand. And the angel of Jehovah was by the threshing-floor of Araunah the Jebusite.

And David spake unto Jehovah when he saw the angel that smote the people, and said, Lo, I have sinned, and I have done perversely; but these sheep, what have they done? let thy hand, I pray thee, be against me, and against my father's house.