Feast of Saint Michael and all Angels
September 29

A Prayer to Saint Michael
Saint Michael, Archangel, defend us in battle.
Be our protection against the wickedness and snares of the Devil. May God rebuke him, we humbly pray;
And do thou, O Prince of the Heavenly Host,
by the power of God, thrust into hell Satan and all the other evil spirits who prowl about the world seeking the ruin of souls. Amen.

Pope John Paul II urges revival of the Prayer to Saint Michael

The Prayer to the Archangel Michael was composed by Pope Leo XIII (d. 1903) after he had a vision of the battle between the "Woman clothed with the sun" and the great dragon who tried to devour her child at birth, in the Book of Revelation 12:1-4. In 1886, the pope decreed that this prayer be said at the end of "low" Mass (not "high", or sung Masses) throughout the universal Church, along with the Salve Regina (Hail, Holy Queen); and the practice of the congregation praying these prayers at the end of Mass continued until about 1970. In 1994, during the International Year of the Family, Pope John Paul II asked all Catholics to pray this prayer daily. He warned that the fate of humanity was in great peril (in particular because of the United Nations Population Conference to be held in Cairo that year). Though he did not order that the prayer be said after Mass, he urged Catholics to pray together to overcome the forces of darkness and evil in the world.

[link to www.adoremus.org]