Third Secret revealed to Sr. Lucia on July 13, 1917

From Vatican website...
CONGREGATION FOR THE DOCTRINE OF THE FAITH
THE MESSAGE OF FATIMA

Throughout history there have been supernatural apparitions and signs which go to the heart of human events and which, to the surprise of believers and non-believers alike, play their part in the unfolding of history. These manifestations can never contradict the content of faith, and must therefore have their focus in the core of Christ's proclamation: the Father's love which leads men and women to conversion and bestows the grace required to abandon oneself to him with filial devotion. This too is the message of Fatima which, with its urgent call to conversion and penance, draws us to the heart of the Gospel.
Fatima is undoubtedly the most prophetic of modern apparitions.
The first and second parts of the “secret”—which are here published in sequence so as to complete the documentation - refer especially to the frightening vision of hell, devotion to the Immaculate Heart of Mary, the Second World War, and finally the prediction of the immense damage that Russia would do to humanity by abandoning the Christian faith and embracing Communist totalitarianism.

English translation of the Third Secret...

"J.M.J.
The third part of the secret revealed at the Cova da Iria-Fatima, on 13 July 1917.
I write in obedience to you, my God, who command me to do so through his Excellency the Bishop of Leiria and through your Most Holy Mother and mine.
After the two parts which I have already explained, at the left of Our Lady and a little above, we saw an Angel with a flaming sword in his left hand; flashing, it gave out flames that looked as though they would set the world on fire; but they died out in contact with the splendour that Our Lady radiated towards him from her right hand: pointing to the earth with his right hand, the Angel cried out in a loud voice: 'Penance, Penance, Penance!'. And we saw in an immense light that is God: 'something similar to how people appear in a mirror when they pass in front of it' a Bishop dressed in White 'we had the impression that it was the Holy Father'. Other Bishops, Priests, men and women Religious going up a steep mountain, at the top of which there was a big Cross of rough-hewn trunks as of a cork-tree with the bark; before reaching there the Holy Father passed through a big city half in ruins and half trembling with halting step, afflicted with pain and sorrow, he prayed for the souls of the corpses he met on his way; having reached the top of the mountain, on his knees at the foot of the big Cross he was killed by a group of soldiers who fired bullets and arrows at him, and in the same way there died one after another the other Bishops, Priests, men and women Religious, and various lay people of different ranks and positions. Beneath the two arms of the Cross there were two Angels each with a crystal aspersorium in his hand, in which they gathered up the blood of the Martyrs and with it sprinkled the souls that were making their way to God.