If we confess our sins, he is faithful and just to forgive us our sins, and to cleanse us from all unrighteousness.
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1 John 1:7-10
Tyndale Open Study Notes (CC BY-SA 4.0).
1:9 To maintain continual fellowship with God, we need to confess our sins to him. Forgiveness and cleansing are guaranteed because God is faithful to his promises and because he acts on the basis of his justice. Christ’s death for our sins fulfills God’s justice and acquits us of our guilt.
Other Bible passages linked to this one, most cited first.
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 forgavest the iniquity of my sin. Selah.
He that covereth his sins shall not prosper: but whoso confesseth and forsaketh them shall have mercy.
And I will cleanse them from all their iniquity, whereby they have sinned against me; and I will pardon all their iniquities, whereby they have sinned, and whereby they have transgressed against me.
Wash me throughly from mine iniquity, and cleanse me from my sin. For I acknowledge my transgressions: and my sin is ever before me. Against 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.
But if we walk in the light, as he is in the light, we have fellowship one with another, and the blood of Jesus Christ his Son cleanseth us from all sin.
Then will I sprinkle clean water upon you, and ye shall be clean: from all your filthiness, and from all your idols, will I cleanse you.
Authorship: the book itself or Christian tradition. Approximate dates, as in Carson and Moo, An Introduction to the New Testament, and Longman and Dillard, An Introduction to the Old Testament.