The Sinner's Prayer

I imagine that the Israelites prayed The Sinner's Prayer in ceremonies, like we pray the Our Father during Mass and occasionally in groups.  Back in the day, 1950's, we children prayed the Our Father, every morning in school. Psalm 51: 1-19, would be a good Sinner's Prayer.

Purify me from my sins, and I will be clean; wash me, and I will be whiter than snow. Oh, give me back my joy again; you have broken me— now let me rejoice. Don’t keep looking at my sins.