Reference

Judges 21:18

Howbeit we may not give them wives of our daughters: for the children of Israel have sworn, saying, Cursed be he that giveth a wife to Benjamin.
16

Then the elders of the congregation said, How shall we do for wives for them that remain, seeing the women are destroyed out of Benjamin?

17

And they said, There must be an inheritance for them that be escaped of Benjamin, that a tribe be not destroyed out of Israel.

18

Howbeit we may not give them wives of our daughters: for the children of Israel have sworn, saying, Cursed be he that giveth a wife to Benjamin.

19

Then they said, Behold, there is a feast of the Lord in Shiloh yearly in a place which is on the north side of Beth–el, on the east side of the highway that goeth up from Beth–el to Shechem, and on the south of Lebonah.

20

Therefore they commanded the children of Benjamin, saying, Go and lie in wait in the vineyards;

Counter-Arguments

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

Israel-Specific Promises

The verse describes a specific oath made by the Israelites regarding the tribe of Benjamin, which is a tribal-specific action rather than a promise or covenant directed at the entirety of ethnic Israel or the Jewish nation in a broader, enduring sense.