We are sinful; all of us have become like unclean men, all our good deeds are like polluted rags; We have all withered like leaves, and our guilt carries us away like the wind. (Isaiah 64:4-5)

If we acknowledge our sins, He is faithful and just and will forgive our sins and cleanse us from every wrongdoing.
(1 John 1:9)

Repent, therefore, and be converted, that your sins may be wiped away, and that the Lord may grant you times of refreshment and send you the Messiah already appointed for you, Jesus.
(Acts 3:19-20)

Repent, for the kingdom of heaven is at hand.
(Matthew 3:2)

Have you sinned, my son? Do so no more, but pray about your former sins.
(Sirach 21:1)

But the tax collector, standing far off, would not even lift up his eyes to heaven, but beat his breast, saying, 'God, be merciful to me a sinner!'
(Luke 18:13)

Father, I have sinned against heaven and against you; I no longer deserve to be called your son.
(Luke 15:21)

Lord, have mercy on me; heal me, I have sinned against you.
(Psalm 41:5)

But you have mercy on all, because you can do all things; and you overlook the sins of men that they may repent.
(Wisdom 11:23)

Have mercy on me, God, in your goodness; in your abundant compassion blot out my offense. Wash away all my guilt; from my sin cleanse me.
(Psalm 51:3-4)

You who fear the LORD, wait for his mercy, turn not away lest you fall. (Sirach 2:7)

To those who repent he grants a return, and he encourages those whose endurance is failing.
(Sirach 17:24)

(c) Paul Buis, 2005