The First Friday Devotions are a set of Catholic devotions to especially recognize the Sacred Heart of Jesus, and through it offer reparations for sins. In the visions of Christ reported by St. Margaret Mary Alacoque in the 17th century, several promises were made to those people that practiced the First Fridays Devotions, one of which included final perseverance.
According to the words of Christ through His apparitions to St. Margaret Mary, there are several promises to those that practice the First Friday Devotions:
"In the excess of the mercy of my Heart, I promise you that my all powerful love will grant to all those who will receive Communion on the First Fridays, for nine consecutive months, the grace of final repentance: they will not die in my displeasure, nor without receiving the sacraments; and my Heart will be their secure refuge in that last hour."
The devotion consists of several practices that are performed on the first Fridays of nine consecutive months. On these days, a person is to attend Holy Mass and receive communion. If the need arises in order to receive communion in a state of grace, a person should also make use of the Sacrament of Penance before attending Mass. In many Catholic communities the practice of the Holy Hour of meditation during the Exposition of the Blessed Sacrament during the First Fridays is encouraged. 
- I will give them all of the graces necessary for their state of life.
- I will establish peace in their houses.
- I will comfort them in all their afflictions.
- I will be their strength during life and above all during death.
- I will bestow a large blessing upon all their undertakings.
- Sinners shall find in My Heart the source and the infinite ocean of mercy.
- Tepid souls shall grow fervent.
- Fervent souls shall quickly mount to high perfection.
- I will bless every place where a picture of my heart shall be set up and honored.
- I will give to priests the gift of touching the most hardened hearts.
- Those who shall promote this devotion shall have their names written in My Heart, never to be blotted out.
- I promise you in the excessive mercy of My Heart that My all-powerful love will grant to all those who communicate on the First Friday in nine consecutive months the grace of final penitence; they shall not die in My disgrace nor without receiving their sacraments; My Divine Heart shall be their safe refuge in this last moment.
See also 
- Peter Stravinskas, 1998, OSV's Catholic Encyclopedia, OSV Press ISBN 0-87973-669-0 page 428
- First Friday Devotion, Aquinas and More. Retrieved on 2 August 2009.
- Roman Catholic worship: Trent to today by James F. White 2003 ISBN 0-8146-6194-7 page 35
- Meditations on the Sacred Heart by Joseph McDonnell 2008 ISBN 1-4086-8658-9 page 118
- Holy Hour of Reparation by Angelus Press 2009 ISBN 978-1-892331-70-0 page 41-43
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