An angel is a messenger from the Lord. The Hebrew word malak, for instance, means “messenger”, “representative,” or “angel.” In the context of the Old Testament it is used in reference to both human and spirit messengers. For that matter, those who come in the name of de Savior ought to be accorded the same respect that would be granted the Master.
This was the spirit in which those in Galatia received the Apostle Paul. Of that reception he wrote: “My temptation which was in my flesh ye despised not, nor rejected; but received me as an angel of God, even as Christ Jesus” (Galatians 4:14).