kING DAVID KNEW THAT HE SINNED AGAINS GOD WHEN HE HAD KILLED HIS CONCUBINE HUSBAND, HE WROTE THIS PSALMS:

 We must always pray for forgiveness. When we refrain to pray for forgiveness, we lived in a cloud of hate and our heart cannot see the light.

¹(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.

²Wash me throughly from mine iniquity, and cleanse me from my sin.

³For I acknowledge my transgressions: and my sin is ever before me.

⁴Against thee, thee only, have I sinned, and done this evil in thy sight: that thou mightest be justified when thou speakest, and be clear when thou judgest.

⁵Behold, I was shapen in iniquity; and in sin did my mother conceive me.

⁶Behold, thou desirest truth in the inward parts: and in the hidden part thou shalt make me to know wisdom.

⁷Purge me with hyssop, and I shall be clean: wash me, and I shall be whiter than snow.

⁸Make me to hear joy and gladness; that the bones which thou hast broken may rejoice.

⁹Hide thy face from my sins, and blot out all mine iniquities.

¹⁰Create in me a clean heart, O God; and renew a right spirit within me.

¹¹Cast me not away from thy presence; and take not thy holy spirit from me.

¹²Restore unto me the joy of thy salvation; and uphold me with thy free spirit.

¹³Then will I teach transgressors thy ways; and sinners shall be converted unto thee.

¹⁴Deliver me from bloodguiltiness, O God, thou God of my salvation: and my tongue shall sing aloud of thy righteousness.

The Prayer of the Penitent
Psalms Chapter 51 : 7

¹⁵O Lord, open thou my lips; and my mouth shall shew forth thy praise.

¹⁶For thou desirest not sacrifice; else would I give it: thou delightest not in burnt offering.

¹⁷The sacrifices of God are a broken spirit: a broken and a contrite heart, O God, thou wilt not despise.

¹⁸Do good in thy good pleasure unto Zion: build thou the walls of Jerusalem.

¹⁹Then shalt thou be pleased with the sacrifices of righteousness, with burnt offering and whole burnt offering: then shall they offer bullocks upon thine altar.