Michael is mentioned three times in theBook of Daniel. The idea that Michael was the advocate of the Jews became so prevalent that, in spite of the rabbinical prohibition against appealing to angels as intermediaries betweenGodand his people, Michael came to occupy a certain place in theJewish liturgy.
In theNew TestamentMichael leads God's armies againstSatan's forces in theBook of Revelation, where during thewar in heavenhe defeats Satan. In theEpistle of JudeMichael is specifically referred to as "the archangel Michael". Catholic sanctuaries to Michael appeared in the 4th century, when he was first seen as a healing angel, and then over time as a protector and the leader of the army of God against the forces of evil.