In the Roman Catholic Church, September 29 is the feast of the archangels Michael, Gabriel, and Raphael. These three are the only archangels mentioned by name in the Bible
Tradition says that, during the judgment of the angels, Michael confronted Lucifer with the question “Who is like God?”. Michael is Hebrew for this question. Michael is considered the prince of the angels partly because, in Daniel 12:1, he is referred to as “Michael, the great prince”.
Michael is also mentioned in the Book of Revelation, Chapter 12, Verse 7: “Then war broke out in heaven; Michael and his angels battled against the dragon (Satan)”. In religious artwork, Michael is usually depicted as being in single combat with the devil.
Saint Michael is the patron saint of paratroopers and police officers and of several major cities including Brussels and Kiev.
The name Gabriel means “man of God”. This archangel first appears in the Bible in the Book of Daniel, Chapter 8 where he helps Daniel understand his visions. In the New Testament, Gabriel serves as God’s messenger. In the first chapter of Luke, he announces the conception of John the Baptist. In the same chapter, he appears to the Blessed Virgin Mary at the Annunciation.
Saint Gabriel the Archangel is, appropriately, the patron saint of post offices and communications workers.
The name Raphael is Hebrew for “God heals”. Raphael, the least known of the three archangels, is mentioned by name only in the Book of Tobit. Raphael appears in human form and rescues Sarah, the daughter of Raguel, from the demon that had murdered her seven husbands (Tobit, Chapters 3-8). He later restores Tobit’s sight and reveals his true identity by saying: “I am Raphael, one of the seven angels who enter and serve before the Glory of the Lord”. (Tobit 12:15)
In the Gospel of John, chapter 5, Jesus heals the man who stayed beside the pool near the Sheep gate. Before being healed, the man said: “Sir, I have no one to put me into the pool when the water is stirred up”. According to tradition, this pool was blessed by God and, every once in a while, an unnamed angel would come down from heaven and stir up the water. The first person who got into the pool after the water was stirred would be miraculously healed. It is thought that the unnamed angel was Raphael.
Saint Raphael the Archangel is invoked to prevent eye problems, nightmares, and insanity.
Source: EWTN online article “St. Michael, St. Gabriel, & St. Raphael”
New American Translation of the Holy Bible