'Messenger' in the Bible

And a messenger of Jehovah goeth out, and smiteth in the camp of Asshur a hundred and eighty and five thousand; and men rise early in the morning, and lo, all of them are dead corpses.

Who is blind but My servant? And deaf as My messenger I send? Who is blind as he who is at peace, Yea, blind, as the servant of Jehovah?

In all their distress He is no adversary, And the messenger of His presence saved them, In His love and in His pity He redeemed them, And He doth lift them up, And beareth them all the days of old.