St. Michael whose name means “Who is like God” was the archangel who fought against satan and all his evil angels, defending all the friends of God. He is the protector of all humanity from the snares of the devil. St. Gabriel which means “Strength of God” announced to Zachariah the forthcoming birth of John the Baptist, and to Mary, the birth of Jesus. His greeting to the Virgin, "Hail, full of grace," is one of the most familiar and frequent prayers of the Christian people. St Raphael meaning “Medicine of God” is the archangel who took care of Tobias on his journey.
The three Archangels Michael, Gabriel and Raphael are the only angels named in Sacred Scripture and all three have important roles in the history of salvation.
Saint Michael is the "Prince of the Heavenly Host," the leader of all the angels. His name is Hebrew for "Who is like God?" and was the battle cry of the good angels against Lucifer and his followers when they rebelled against God. He is mentioned four times in the Bible, in Daniel 10 and 12, in the letter of Jude, and in Revelation.
Michael, whose forces cast down Lucifer and the evil spirits into Hell, is invoked for protection against Satan and all evil. Pope Leo XIII, in 1899, having had a prophetic vision of the evil that would be inflicted upon the Church and the world in the 20th century, instituted a prayer asking for Saint Michael's protection to be said at the end of every Mass.
Christian tradition recognizes four offices of Saint Michael: (i) to fight against Satan (ii) to rescue the souls of the faithful from the power of the enemy, especially at the hour of death. (iii) to be the champion of God's people, (iv) to call away from earth and bring men's souls to judgment.
"I am Gabriel, who stand before God." (Luke 1, 19)
Saint Gabriel, whose name means "God's strength," is mentioned four times in the Bible. Most significant are Gabriel's two mentions in the New Testament: to announce the birth of John the Baptist to his father Zacharias, and the at Incarnation of the Word in the womb of Mary.
Christian tradition suggests that it is he who appeared to St. Joseph and to the shepherds, and also that it was he who "strengthened" Jesus during his agony in the garden of Gethsemane.
"I am the angel Raphael, one of the seven, who stand before the Lord" (Tob 12:15)
Saint Raphael, whose name means "God has healed" because of his healing of Tobias' blindness in the Book of Tobit. Tobit is the only book in which he is mentioned. His office is generally accepted by tradition to be that of healing and acts of mercy.
Raphael is also identified with the angel in John 5:1-4 who descended upon the pond and bestowed healing powers upon it so that the first to enter it after it moved would be healed of whatever infirmity he was suffering.
For more information on the Archangels Michael, Gabriel and Raphael, please click on the following links:
The Archangel Prayers Prayer to St. Michael, the Archangel Saint Michael the Archangel Story How The Prayer Of St. Michael Came To Be Written Saint Michael Archangel Apparitions Chaplet of St. Michael The Archangel Novena To Saint Michael The Archangel Litany Of St. Michael The Archangel Prayer to St. Gabriel, the Archangel St.Gabriel Prayer Litany of St Gabriel Prayer to St. Raphael, the Archangel Saint Raphael Prayer Prayer to St Raphael for Healing Prayer to St Raphael Before a Trip Prayer to St. Raphael: Patron of Travelers & Bearers of the Good News Prayer to St Raphael For the Choice of a Good Spouse Litany in Honor of St. Raphael 
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