I’ve got a soft spot for this prayer, growing up I went to school at Saint Michael’s from first to eight grade. I’m sure at some point we were taught the prayer and we’d pray it like when we would attend one of the daily Masses during like Lent not on a first Friday or something, It’s been a while since I was there. Anyways the prayer is one of the Leonine Prayers that Pope Leo XIII added after the celebration of a low mass, now this tradition was ended during Vatican II, however to this day we still have some individuals who pray some type of prayer after a low Mass. This prayer is as follows:
Saint Michael the 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, cast into hell
Satan and all the evil spirits
who prowl through the world seeking the ruin of souls.
Although no longer prescribe for after a low Mass, Pope John Paul II in one of his Regina Caeli addresses on 24 April 1994 where he said “‘Although this prayer is no longer recited at the end of Mass, I ask everyone not to forget it and to recite it to obtain help in the battle against the forces of darkness and against the spirit of this world.” So if you have some time learn this prayer it a pretty neat prayer and as the world seems to be on the brink it is always nice to have an archangel on our side.