On 10th of december 1925 in a cell of house of religious of St. Dorothy in Ponteverda The Blessed Virgin and by Her Infant Jesus appeared to St.Lucia. Our Lord Jesus and Heavenly Mother explained to her how to make an act of reparation:
The elements of The Five First Saturdays Devotion
Confession offered in reparation
One has to offer a very good confession on the first Saturday of the month, before or after this Saturday, but while being in state of santifying grace. - This confession counts as reparation, even if one confesses week before or after the first Saturday. During one of the apparitions Sister Lucia asked Our Lord, what should do these people who forget in time of their confession about the intention of reparation. She received an anwser:"They can form this intention during next confession, taking advantage of the first opportunity". According to the explanation given by sister Lucia, next three elements should be accomplished on the first saturday of the month, however for the justified reason, a confessor may allow to complete them on sunday after the first saturday of the month.
Holy Communion in form of reparation
One has to offer this Holy Communion in intention of reparation for the blasphemies and insults which people dare to commit against The Immaculate Heart of Heavenly Mother
5 decades of Holy Rosary
Before recitation one has to make an intention of reparation, by telling The Heavenly Mother, that this is a prayer for salvation of sinners and a proof of our love to Her.
This element is accomplished by a meditation made over 15 mystries of the Holy Rosary for time of 15 minutes. Our Heavenly Mother called this meditation "keeping Her company over meditation" - and this is how it should be done.
One can read first a chapter from The Holy Scripture which relates to particular mystery. Again one should form an intention of reparation.
If one cannot fullfil these conditions, would it be possible to make it day after, on Sunday?
Sister Lucia anwsers: "Practice over this Devotion on Sunday after first Saturday of the month will be accepted, if my priest allow it to souls by justified reason:/
Promises: What are graces promised to those who will complete this Devotion at least a single time
"I promise to assist at the hour of death with the graces necessary for salvation." This means that our Blessed Mother will be present at the hour of death with the actual grace of final perseverance (which after the gift/grace of Faith), is the most important grace.