Psalm 32:5
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.

Psalm 51:1-19
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. [2] Wash me thoroughly from mine iniquity, and cleanse me from my sin. [3] For I acknowledge my transgressions: and my sin is ever before me. [4] Against 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. [5] Behold, I was shaped in iniquity; and in sin did my mother conceive me. [6] Behold, thou desires truth in the inward parts: and in the hidden part thou shall make me to know wisdom. [7] Purge me with hyssop, and I shall be clean: wash me, and I shall be whiter than snow. [8] Make me to hear joy and gladness; that the bones which thou hast broken may rejoice. [9] Hide thy face from my sins, and blot out all mine iniquities. [10] Create in me a clean heart, O God; and renew a right spirit within me. [11] Cast me not away from thy presence; and take not thy holy spirit from me. [12] Restore unto me the joy of thy salvation; and uphold me with thy free spirit. [13] Then will I teach transgressors thy ways; and sinners shall be converted unto thee. [14] Deliver me from bloodguiltiness, O God, thou God of my salvation: and my tongue shall sing aloud of thy righteousness. [15] O Lord, open thou my lips; and my mouth shall shew forth thy praise. [16] For thou desirest not sacrifice; else would I give it: thou delightest not in burnt offering. [17] The sacrifices of God are a broken spirit: a broken and a contrite heart, O God, thou wilt not despise. [18] Do good in thy good pleasure unto Zion: build thou the walls of Jerusalem. [19] Then shalt thou be pleased with the sacrifices of righteousness, with burnt offering and whole burnt offering: then shall they offer bullocks upon thine altar.

Psalm 139:23-24
Search me, O God, and know my heart: try me, and know my thoughts: [24] And see if there be any wicked way in me, and lead me in the way everlasting.

Isaiah 55:7
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.

Proverbs 28:13
He that covereth his sins shall not prosper: but whoso confesses and forsakes them shall have mercy.

Romans 14:11-12
For it is written, As I live, saith the Lord, every knee shall bow to me, and every tongue shall confess to God. [12] So then every one of us shall give account of himself to God.

James 5:16
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.