I acknowledged my sin unto thee, and mine iniquity have I not hid. I said, I will confess my transgressions unto the Lord; and thou forgives the iniquity of my sin. Selah.
To the chief Musician, A Psalm of David, when Nathan the prophet came unto him, after he had gone in to Bathsheba. Have mercy upon me, O God, according to thy lovingkindness: according unto the multitude of thy tender mercies blot out my transgressions.
me thoroughly from mine iniquity, and cleanse me from my sin.
I acknowledge my transgressions: and my sin is ever before me.
thee, thee only, have I sinned, and done this evil in thy sight: that thou
mightest be justified when thou speaks, and be clear when thou judgest.
I was shaped in iniquity; and in sin did my mother conceive me.
thou desires truth in the inward parts: and in the hidden part thou shall make
me to know wisdom.
me with hyssop, and I shall be clean: wash me, and I shall be whiter than snow.
me to hear joy and gladness; that the bones which thou hast broken may rejoice.
thy face from my sins, and blot out all mine iniquities.
in me a clean heart, O God; and renew a right spirit within me.
me not away from thy presence; and take not thy holy spirit from me.
unto me the joy of thy salvation; and uphold me with thy free spirit.
will I teach transgressors thy ways; and sinners shall be converted unto thee.
me from bloodguiltiness, O God, thou God of my salvation: and my tongue shall
sing aloud of thy righteousness.
Lord, open thou my lips; and my mouth shall shew forth thy praise.
thou desirest not sacrifice; else would I give it: thou delightest not in burnt
sacrifices of God are a broken spirit: a broken and a contrite heart, O God,
thou wilt not despise.
good in thy good pleasure unto Zion: build thou the walls of Jerusalem.
shalt thou be pleased with the sacrifices of righteousness, with burnt offering
and whole burnt offering: then shall they offer bullocks upon thine altar.
Search me, O God, and know my heart: try me, and know my thoughts:  And see if there be any wicked way in me, and lead me in the way everlasting.
Let the wicked forsake his way, and the unrighteous man his thoughts: and let him return unto the Lord, and he will have mercy upon him; and to our God, for he will abundantly pardon.
He that covereth his sins shall not prosper: but whoso confesses and forsakes them shall have mercy.
For it is written, As I live, saith the Lord, every knee shall bow to me, and every tongue shall confess to God. So then every one of us shall give account of himself to God.
Confess your faults one to another, and pray one for another, that ye may be healed. The effectual fervent prayer of a righteous man avails much.
1 John 1:9
If we confess our sins, he is faithful and just to forgive us our sins, and to cleanse us from all unrighteousness.