The belief that an angel is assigned by God to protect each person was not clearly defined in the Old Testament. In the New Testament church, the concept is supported by passages found in Acts 12:15 (They said, [in reference to Peter] “It is his angel.”) and Mt. 18:10 (“Take care that you do not despise one of these little ones; for I tell you, in heaven their angels continually see the face of my Father in heaven”). The Church celebrates the feast of the Guardian Angels every Oct. 2.