 The devotion fits on the Catholic tradition to venerate the Virgin Mary particularly on Saturdays, which originated in the scriptural account that, as the Mother of Jesus Christ, her heart was to be pierced with a sword, as prophesied during the presentation of Jesus in the temple; such sword was the bitter sorrow during the Crucifixion of Jesus (which Catholic devotees understand as the union of the Immaculate Heart of Mary and the Sacred Heart of Jesus).Such sorrow is particularly bitterly endured on Holy Saturday after Jesus was placed on the Sepulcher (before the Resurrection on Easter).Devotees of Fátima believe that the First Saturdays help to console the sorrows of the Lord Jesus and the Virgin Mary for the sins against Her Immaculate Heart.