Matthew 19: 9
(NIV) I tell you that anyone who divorces his wife, except for sexual immorality, and marries another woman commits adultery.
(Douai) And I say to you, that whosoever shall put away his wife, except it be for fornication, and shall marry another, committeth adultery: and he that shall marry her that is put away, committeth adultery.
In Mark the exception to the general rule is not mentioned, in Matthew it is.
Jesus Appears to the Disciples
…22And when He had said this, He breathed on them and said to them, “Receive the Holy Spirit. 23”If you forgive the sins of any, their sins have been forgiven them; if you retain the sins of any, they have been retained.”
Is there a limit on that?