Matthew 3:8 Bring forth therefore fruits meet for repentance.
Isa. 30.15 This is what the Sovereign LORD, the Holy One of Israel, says: “In repentance and rest is your salvation, in quietness and trust is your strength, but you would have none of it.
“Yea, I and my father’s house have sinned. 7 We have acted very corruptly against thee, and have not kept the commandments, the statutes, and the ordinances which thou didst command thy servant Moses. 8 Remember the word which thou didst command thy servant Moses, saying, ‘If you are unfaithful, I will scatter you among the peoples; 9 but if you return to me and keep my commandments and do them, though your dispersed be under the farthest skies, I will gather them thence and bring them to the place which I have chosen, to make my name dwell there.’ 10 They are thy servants and thy people, whom thou hast redeemed by thy great power and by thy strong hand. 11 O Lord, let thy ear be attentive to the prayer of thy servant, and to the prayer of thy servants who delight to fear thy name; and give success to thy servant today, and grant him mercy in the sight of this man. — Nehemiah chapter 1
Proverbs 28: 13 He who covers his sins will not prosper, But whoever confesses and forsakes them will have mercy
James 4:8 Draw near to God, and He will draw near to you. Cleanse your hands, you sinners; and purify your hearts, you double-minded.
Acts 3 vs 19 Repent, then, and turn to God so that your sins may be wiped out, that times of refreshing may come from the Lord.
Jer. 31. 19 After I strayed, I repented; after I came to understand, I beat my breast. I was ashamed and humiliated because I bore the disgrace of my youth.’
When God saw their deeds, that they turned from their wicked way, then God relented concerning the calamity which He had declared He would bring upon them. And He did not do it.
Therefore remember from where you have fallen, and repent and do the deeds you did at first; or else I am coming to you and will remove your lampstand out of its place—unless you repent.
“Yet even now,” declares the Lord,
“Return to Me with all your heart,
And with fasting, weeping and mourning;
And rend your heart and not your garments.”
Now return to the Lord your God,
For He is gracious and compassionate,
Slow to anger, abounding in lovingkindness
And relenting of evil
Have mercy on me, O God, according to thy great mercy. And according to the multitude of thy tender mercies blot out my iniquity.  Wash me yet more from my iniquity, and cleanse me from my sin.  For I know my iniquity, and my sin is always before me.
 To thee only have I sinned, and have done evil before thee: that thou mayst be justified in thy words and mayst overcome when thou art judged.  For behold I was conceived in iniquities; and in sins did my mother conceive me.  For behold thou hast loved truth: the uncertain and hidden things of thy wisdom thou hast made manifest to me.  Thou shalt sprinkle me with hyssop, and I shall be cleansed: thou shalt wash me, and I shall be made whiter than snow.  To my hearing thou shalt give joy and gladness: and the bones that have been humbled shall rejoice.
 Turn away thy face from my sins, and blot out all my iniquities.  Create a clean heart in me, O God: and renew a right spirit within my bowels.  Cast me not away from thy face; and take not thy holy spirit from me.  Restore unto me the joy of thy salvation, and strengthen me with a perfect spirit.  I will teach the unjust thy ways: and the wicked shall be converted to thee.
 Deliver me from blood, O God, thou God of my salvation: and my tongue shall extol thy justice.  O Lord, thou wilt open my lips: and my mouth shall declare thy praise.  For if thou hadst desired sacrifice, I would indeed have given it: with burnt offerings thou wilt not be delighted.  A sacrifice to God is an afflicted spirit: a contrite and humbled heart, O God, thou wilt not despise.  Deal favourably, O Lord, in thy good will with Sion; that the walls of Jerusalem may be built up.
 Then shalt thou accept the sacrifice of justice, oblations and whole burnt offerings: then shall they lay calves upon thy altar.