If we say, ‘We have no sin,’ we are deceiving ourselves, and truth has no place in us; if we acknowledge our sins, he is trustworthy and upright, so that he will forgive our sins and will cleanse us from all evil.

[Ἐὰν εἴπωμεν ὅτι ἁμαρτίαν οὐκ ἔχομεν ἑαυτοὺς πλανῶμεν καὶ ἡ ἀλήθεια οὐκ ἔστιν ἐν ἡμῖν. ἐὰν ὁμολογῶμεν τὰς ἁμαρτίας ἡμῶν πιστός ἐστιν καὶ δίκαιος ἵνα ἀφῇ ἡμῖν τὰς ἁμαρτίας καὶ καθαρίσῃ ἡμᾶς ἀπὸ πάσης ἀδικίας.]

The Bible (The New Testament) (AD 1st - 2nd C) Christian sacred scripture

1 John 1:8-9 [NJB (1985)]
    (Source)

(Source (Greek)). Alternate translations:

If we say we have no sin, we deceive ourselves, and the truth is not in us.
If we confess our sins, he is faithful and just, and will forgive our sins and cleanse us from all unrighteousness.
[KJV (1611)]

If we say we have no sin in us, we are deceiving ourselves and refusing to admit the truth; but if we acknowledge our sins, then God who is faithful and just will forgive our sins and purify us from everything that is wrong.
[JB (1966)]

If we say that we have no sin, we deceive ourselves, and there is no truth in us. But if we confess our sins to God, he will keep his promise and do what is right: he will forgive us our sins and purify us from all our wrongdoing.
[GNT (1976)]

If we claim, “We don’t have any sin,” we deceive ourselves and the truth is not in us. But if we confess our sins, he is faithful and just to forgive us our sins and cleanse us from everything we’ve done wrong.
[CEB (2011)]

If we say that we have no sin, we deceive ourselves, and the truth is not in us. If we confess our sins, he who is faithful and just will forgive us our sins and cleanse us from all unrighteousness.
[NRSV (2021 ed.)]