The Prophecy of Fatima (July 13,1917)
"To save souls, the Lord desires that devotion to my (Blessed Virgin) Immaculate Heart be established in the world. If what I tell you is done, many souls will be saved and there will be peace. The war will end; but, if they do not cease to offend the Lord, not much time will elapse, and precisely in the next Pontificate (Pius XI) another and more terrible war will commence."
To prevent "the castigation of the world for its many trans
gressions" the vision asked the "consecration of the world to
my Immaculate Heart l and Communion in reparation on the first Saturday of each month. If my requests are heard, Russia will be converted and there will be peace. Otherwise, great errors will be spread through the world, giving rise to wars and persecutions against the Church; the good will suffer martyrdom and the Holy Father will have to suffer much; different nations will be destroyed; but, in the end, my Immaculate Heart will triumph and an era of peace will be conceded to humanity."
Source
THE PROPHETS AND OUR TIMES By Rev. R. Gerald Culleton