'Messenger' in the Bible

Paul, an apostle (special messenger, personally chosen representative) of Christ Jesus (the Messiah) by the will of God, and Timothy our brother,To the church of God which is at Corinth, and to all the saints (God’s people) throughout Achaia (southern Greece):

and no wonder -- for even the Adversary doth transform himself into a messenger of light;

And lest I should be exalted above measure through the abundance of the revelations, there was given to me a thorn in the flesh, the messenger of Satan to buffet me, lest I should be exalted above measure.