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.
Judges 21:5 stands in the closing chapters of Judges, chapters 17-21, which record Israel's backsliding and its consequent disgrace and punishment. In that setting it belongs to the account of the crime at Gibeah, where the whole tribe of Benjamin identified with the guilty people. That identification set conventional hospitality above female virtue and loyalty to a tribe above rendering justice. Those closing chapters record events that occurred in the early part of the history of the judges, so the verse is out of chronological order and the main story of the book really ends with chapter 16.
The verse reflects Israel's low spiritual condition near the end of the period of the judges. It records Israel's oath at Mizpeh or Mizpah that anyone who failed to come up with the congregation to the Lord would surely be put to death. Its use of assembly or congregation for Israel illustrates the Old Testament use later rendered by Greek translators as ekklesia, showing that God's congregation then was the same called-out people as the church in later times. As part of Israel's backsliding, the verse shows that no one can backslide with impunity. The sins it exposes, still seen today, are never excusable.