[12] For to the rest I speak, not the Lord. If any brother hath a wife that believeth not, and she consent to dwell with him, let him not put her away.
[13] And if any woman hath a husband that believeth not, and he consent to dwell with her, let her not put away her husband.
[14] For the unbelieving husband is sanctified by the believing wife; and the unbelieving wife is sanctified by the believing husband: otherwise your children should be unclean; but now they are holy.
[15] But if the unbeliever depart, let him depart. For a brother or sister is not under servitude in such cases. But God hath called us in peace.
[16] For how knowest thou, O wife, whether thou shalt save thy husband? Or how knowest thou, O man, whether thou shalt save thy wife?
OK, first, I have to make a large technical correction. I have been referring in some of my comments to v14 in the context of 15 and 16. When I did this, I should have been talking about v12&13. I was thinking 16 is the ‘hope’ verse, 15 was the ‘NB leaves’ verse and 14 was the ‘NB stays’ verse. I apologize for the confusion. So if I said v14, I probably meant v12&13.
The structure is basically:
12 - NB wife stays
13 - NB husband stays (mirror of 12)
…14 - sub comment about children as it relates to ‘staying’ in 12 and 13
15 - NB leaves
16 - B spousal act might save NB
So two of the thoughts put forward to support the PP would be to either swap 15 and 16 or not have 16 at all, which would look like these:
12 - NB wife stays
13 - NB husband stays (mirror of 12)
…14 - sub comment about children as it relates to ‘staying’ in 12 and 13
16 - B spousal act might save NB
15 - NB leaves
This links the spousal act to the staying scenario and leaves the leaving scenario to stand in complete contrast.
12 - NB wife stays
13 - NB husband stays (mirror of 12)
…14 - sub comment about children as it relates to ‘staying’ in 12 and 13
15 - NB leaves
This is clear because it says, if stays, then stay; if leaves, then let him leave. Although this wouldn’t state the B could remarry specifically (would have been clearer if it did), it is more conducive to the idea of the B who’s NB leaves being free to remarry.