Be very, very careful here. Are you willing to say that marriage after divorce for other than biblical reasons is unforgivable? Because that is what you're saying. Do you want to go there?
Doesn't bother me at all to "go there."
It is not MY words, but the very words of Christ.
It is not what I am saying, but the very words of Christ.
Matt: 19
6“So they are no longer two, but one flesh. What therefore God has joined together, let no man separate.” 7They said to Him, “Why then did Moses command to GIVE HER A CERTIFICATE OF DIVORCE AND SEND her AWAY?” 8He said to them, “Because of your hardness of heart Moses permitted you to divorce your wives; but from the beginning it has not been this way.
Matt: 5
31“It was said, ‘WHOEVER SENDS HIS WIFE AWAY, LET HIM GIVE HER A CERTIFICATE OF DIVORCE’; 32but I say to you that everyone who divorces his wife, except for the reason of unchastity, makes her commit adultery; and whoever marries a divorced woman commits adultery.
NOTE: Unchastity, was why Joseph wanted to "put Mary away, privately."
Mary was a VIRGIN; she and Joseph had not yet become "one flesh."
THAT is the "unchastity" in which the Lord Jesus Christ presents as a lawful reason for divorce - NOT adultery AFTER the two become one flesh.
No, woman retains her "chastity" when the two become "one flesh."
If it is not so, then Christ would have no grounds to make the statement "what GOD puts together, let no man disassemble." No grounds at all, and the whole matter would be settled with the "law of Moses."
But, the "law of Moses" wasn't the final authority. For, "from the beginning" it wasn't what God presented nor intended.
Hardness of hearts was the cause for the "law of Moses" and I have yet to see the cause for divorce as other then the "hardness of heart" as the basic reason.
The question then comes, is the situation "unforgivable?"
No.
However, just as YOU contended in another thread on the assembly facing a polygamous marriage issue and new believers in the church, the couple perhaps needs to consider
FOR THEMSELVES and before the Lord what they in good conscience can live with.
However, just as I contended in that same thread, dismembering the family unit (including all partners) is NOT Scriptural, anymore than divorce after the two have become "one flesh."
However, what of the believer with an unbelieving spouse? What did Paul give as the answer when confronted with those who were believing and had spouses that were unbelieving?
If the unbelieving spouse wanted divorce - let them, but the believer was NEVER (until the death of that unbelieving spouse) to marry. The believing spouse was NEVER to seek divorce.
What do the vow to God say?
"'Til death do us part."