Judges 17:6 contains the identical refrain summarizing the moral chaos; here it concludes the book with the same assessment.

Judges 19:1 uses the same 'no king' phrase to introduce the Levite's story; here it concludes the book with the same moral.

Judges 18:1 also begins with 'no king in Israel', introducing the Danites' search; here it's the book's concluding summary.

Proverbs 14:12 echoes that a way seems right but ends in death — the outcome when everyone does what is right in their own eyes.

Hosea 9:9 references the 'days of Gibeah' from Judges 19-21 — the very context that Judges 21:25 summarizes as everyone doing what was right.

Deuteronomy 12:8 warns against doing what is right in one's own eyes, which is exactly the condition described here as the cause of chaos.