'Angel of the Lord' in the Bible

but an angel of the Lord opened the prison-doors by night, and having brought them out, said to them,

when forty years were expired, there appeared to him in the wilderness of mount Sina, an angel of the Lord in a flaming bush.

Now an angel of the Lord spoke to Philip, saying, arise, and go toward the south, by the way that leads from Jerusalem to Gaza, in the desart.

but at the instant an angel of the Lord smote him, because he did not glorify God: so that he became a prey to worms and died. In the mean time, the