The Book of PsalmsPsalm 129
De profundis. A prayer of a sinner, trusting in the mercies of God. The sixth penitential psalm.
The Douay-Rheims numbers the Psalms as the Latin Vulgate does. In Bibles translated from the Hebrew this is Psalm 130. Read Psalm 130 in the WEBC.

129Out of the depths I have cried to thee, O Lord:
2Lord, hear my voice. Let thy ears be attentive to the voice of my supplication.
3If thou, O Lord, wilt mark iniquities: Lord, who shall stand it.
4For with thee there is merciful forgiveness: and by reason of thy law, I have waited for thee, O Lord. My soul hath relied on his word:
5My soul hath hoped in the Lord.
6From the morning watch even until night, let Israel hope in the Lord.
7Because with the Lord there is mercy: and with him plentiful redemption.
8And he shall redeem Israel from all his iniquities.