First Friday Devotion. The First Friday Devotions are a set ofCatholic devotions to especially recognize the Sacred Heart of Jesus, and through it offer reparations for sins.

The Lord in private revelation to Saint Margaret Mary:

"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 of 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."

From the Directory on Popular Piety of the Holy See:

"Devotions to the Sacred Heart of Jesus are numerous. Some have been explicitly approved and frequently recommended by the Apostolic See. The pious practice of the first Fridays of the month derives from the "great promises" made by Jesus to St. Margaret Mary. At a time when sacramental communion was very rare among the faithful, the first Friday devotion contributed significantly to a renewed use of the Sacraments of Penance and of the Holy Eucharist. In our own times, the devotion to the first Fridays, even if practised correctly, may not always lead to the desired spiritual fruits. Hence, the faithful require constant instruction so that any reduction of the practice to mere credulity, is avoided and an active faith encouraged so that the faithful may undertake their commitment to the Gospel correctly in their lives. They should also be reminded of the absolute preeminence of Sunday, the "primordial feast", which should be marked by the full participation of the faithful at the celebration of the Holy Mass."