O My Jesus, forgive us our sins, save us from the fires of Hell and lead all souls to Heaven, especially those who are in most need of Thy mercy.
Further reading
This brief plea for forgiveness widens into a prayer for every soul in need of mercy. In Fatima for Today, Fr. Andrew Apostoli explains the Fatima message and its call to prayer, penance and intercession for others.
Fatima for Today: The Urgent Marian Message of Hope by Fr. Andrew Apostoli, C.F.R. (paperback) on Amazon (paid link)