This prayer was taught by an Angel named the Angel of Peace to the three children at Fatima, Jacinto, Francisco and Lucia. The Angel knelt down beside them and made them repeat three times, both before and after he gave the Sacred Host and Precious Blood of Christ to them.
The Angel said, "Take and drink the Body and Blood of Jesus Christ, horribly outraged by ungrateful people! Make reparation for their crimes and console your God."
He also gave them this prayer:
O Most Holy Trinity, Father, Son and Holy Spirit, I adore You profoundly.
I offer You the most precious Body, Blood, Soul and Divinity of my Lord Jesus Christ, which I acknowledge truly present in the Holy Eucharist, in the Living and Glorious tabernacle of your Divinity the Immaculate Heart of Mary and in all the tabernacles throughout the world, in my soul, in every consecrated soul, in every host or chalice that is consecrated to You in the Holy mass; as my Lord, my God and my Saviour, the Sacrificial Lamb of God, and I offer Him to you in atonement for my sins and for the sins of the whole world, and in reparation for the outrages, sacrileges and indifference by which Jesus and Mary are offended.
The angel of Peace also gave the three children of Fatima this prayer:
"My God, I believe, I adore, I hope and I love You! I ask pardon of You for those who do not believe, do not adore, do not hope and do not love You."
"The Hearts of Jesus and Mary are attentive to the voice of your supplications."
After the apparitions, Sister Lucia also received from Our Lord, this prayer to be added between the decades of the Holy Rosary
"O my Jesus! Forgive us, save us from the fire of hell. Lead all souls to heaven, especially those who are most in need."
(Intention after we say these prayers)
By the infinite merits of the Most Sacred Heart of Jesus and of the Immaculate Heart of Mary, I pray for the conversion of poor sinners...