What does the New Testament say about the Guardian Angels?

In the New Testament we can see the concept of guardian angel. Angels are everywhere the intermediaries between God and man; and Christ put a seal on the teaching of the Old Testament: "See that you do not despise any of these little ones: because I tell you that their angels in heaven always see the face of my Father who is in heaven". (Matthew 18:10).

Other examples in the New Testament are the angel who rescued Christ in the garden and the angel who freed St. Peter from prison. In Acts 12: 12-15, after Peter was escorted out of prison by an angel, he went to the house of "Mary, the mother of John, also called Mark". The maid, Rhoda, recognized her voice and ran back to tell the group that Peter was there. However, the group replied: "It must be his angel" (12:15). With this scriptural sanction, the angel of Peter was the guardian angel most commonly depicted in art, and was normally shown in the images of the subject, the most famous Raphael fresco of the Liberation of St. Peter in the Vatican.

Hebrews 1:14 says: "Are not all the spirit ministers, sent to minister to them, to receive the inheritance of salvation?" In this perspective, the function of the guardian angel is to lead people into the Kingdom of Heaven.

In the New Testament epistle of Judah, Michael is described as an archangel.