If you forgive others their sins, your heavenly Father will also forgive you. But if you don’t forgive others, neither will your Father forgive your sins.

[Ἐὰν γὰρ ἀφῆτε τοῖς ἀνθρώποις τὰ παραπτώματα αὐτῶν, ἀφήσει καὶ ὑμῖν ὁ πατὴρ ὑμῶν ὁ οὐράνιος· ἐὰν δὲ μὴ ἀφῆτε τοῖς ἀνθρώποις, οὐδὲ ὁ πατὴρ ὑμῶν ἀφήσει τὰ παραπτώματα ὑμῶν.]

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

Matthew 6: 14-15 (Jesus) [CEB (2011)]
    (Source)

No Synoptic parallels. This passage in Matthew immediately follows the Lord's Prayer which includes a petition for the forgiveness of sins.

(Source (Greek)). Alternate translations:

For if ye forgive men their trespasses, your heavenly Father will also forgive you: but if ye forgive not men their trespasses, neither will your Father forgive your trespasses.
[KJV (1611)]

Yes, if you forgive others their failings, your heavenly Father will forgive you yours; but if you do not forgive others, your Father will not forgive your failings either.
[JB (1966); NJB (1985)]

If you forgive others the wrongs they have done to you, your Father in heaven will also forgive you. But if you do not forgive others, then your Father will not forgive the wrongs you have done.
[GNT (1976)]

For if you forgive others their trespasses, your heavenly Father will also forgive you, but if you do not forgive others, neither will your Father forgive your trespasses.
[NRSV (2021 ed.)]

The NRSV notes some ancient manuscripts adds to the second "forgive others" the specific "their trespasses."