'Messenger' in the Bible

And a messenger hath come in unto Saul, saying, 'Haste, and come, for the Philistines have pushed against the land.'

And Achish answereth and saith unto David, 'I have known that thou art good in mine eyes as a messenger of God; only, the princes of the Philistines have said, He doth not go up with us into battle;