Saint Gertrude's Purgatory Prayer

Eternal Father, I offer Thee the Most Precious Blood of Thy Divine Son, Jesus, in union with the Masses said throughout the world today, for all the holy souls in purgatory, for sinners everywhere, for sinners in the Universal Church, those in my own home and within my family. Amen.
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Our Lord told Saint Gertrude the Great that the following prayer would release 1,000 souls from Purgatory each time it is said. The prayer was extended to include living sinners to alleviate indebtedness accrued during their lives. -- http://holyspiritmims.com/news/purgatory-prayer