Novena for the Holy Souls in Purgatory

O most sweet Jesus, through the bloody sweat which Thou didst suffer in the Garden of Gethsemane, have mercy on these Blessed Souls. Have mercy on them.
R. Have mercy on them, O Lord.

O most sweet Jesus, through the pains which Thou didst suffer during Thy most cruel scourging, have mercy on them.
R. Have mercy on them, O Lord.

O most sweet Jesus, through the pains which Thou didst suffer in Thy most painful crowning with thorns, have mercy on them.
R. Have mercy on them, O Lord.

O most sweet Jesus, through the pains which Thou didst suffer in carrying Thy cross to Calvary, have mercy on them.
R. Have mercy on them, O Lord.

O most sweet Jesus, through the pains which Thou didst suffer during Thy most cruel Crucifixion, have mercy on them.
R. Have mercy on them, O Lord.

O most sweet Jesus, through the pains which Thou didst suffer in Thy most bitter agony on the Cross, have mercy on them.
R. Have mercy on them, O Lord.

O most sweet Jesus, through the immense pain which Thou didst suffer in breathing forth Thy Blessed Soul, have mercy on them.
R. Have mercy on them, O Lord.

(Recommend yourself to the Souls in Purgatory and mention your intentions here)

Blessed Souls, I have prayed for thee; I entreat thee, who are so dear to God, and who are secure of never losing Him, to pray for me a miserable sinner, who is in danger of being damned, and of losing God forever. Amen.

https://www.ewtn.com/Devotionals/novena/Purgatory.htm