Reference

Judges 21:5

And the children of Israel said, Who is there among all the tribes of Israel that came not up with the congregation unto the Lord? For they had made a great oath concerning him that came not up to the Lord to Mizpeh, saying, He shall surely be put to death.
3

And said, O Lord God of Israel, why is this come to pass in Israel, that there should be to day one tribe lacking in Israel?

4

And it came to pass on the morrow, that the people rose early, and built there an altar, and offered burnt offerings and peace offerings.

5

And the children of Israel said, Who is there among all the tribes of Israel that came not up with the congregation unto the Lord? For they had made a great oath concerning him that came not up to the Lord to Mizpeh, saying, He shall surely be put to death.

6

And the children of Israel repented them for Benjamin their brother, and said, There is one tribe cut off from Israel this day.

7

How shall we do for wives for them that remain, seeing we have sworn by the Lord that we will not give them of our daughters to wives?

Counter-Arguments

The strongest case that this verse does not belong in this theme.

Israel-Specific Promises

The verse describes an oath made by the Israelites, not a promise or covenant from God to Israel. The oath is about internal tribal discipline, not a divine promise to the nation.