Judges 21:5

5The Israelites asked, “Who from all the Israelite tribes has not assembled before the Lord?” They had made a solemn oath that whoever did not assemble before the Lord at Mizpah must certainly be executed.
Heb “A great oath there was concerning the one who did not go up before the Lord at Mizpah, saying, ‘He must surely be put to death.’”
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