Judges 21:5-11
And the children of Israel said, Who is there among all the tribes of Israel that came not up with the congregation to 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.
Nave's Topical Index—AKJV

Judges 20:1
Then all the children of Israel went out, and the congregation was gathered together as one man, from Dan even to Beersheba, with the land of Gilead, to the LORD in Mizpeh.
Nave's Topical Index—AKJV