On December 10, 1925, seven years after the end of the apparitions in Fatima, Mary and Child appeared to Sister Lucia showed her a heart surrounded by thorns and addressed the words:
During the apparition, Sister Lucia asked why five such Saturdays. In response, she heard that there are five kinds of offenses and blasphemies committed against the Immaculate Heart of Mary. They are:
The essence of the service on the first five Saturdays of the month is to make reparation for sins committed against the Immaculate Heart of the Blessed Virgin Mary.
A short Fatima invocation to the Immaculate Heart of Mary
Sorrowful and Immaculate Heart of Mary, have mercy on us.
Sorrowful and Immaculate Heart of Mary, intercede for us.
Sorrowful and Immaculate Heart of Mary, help us.
Sorrowful and Immaculate Heart of Mary, save us.
Sorrowful and Immaculate Heart of Mary, protect us.