Where did Jesus say this?

I saw in the group Let’s empty purgatory the following:
Jesus said if we pray this prayer 1,000 souls from purgatory are released: “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.”

Where may I locate that citation, please. First time I’ve ever heard it. Thank you.

It is reported that St. Gertrude the Great received the message from Jesus in a vision.

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