Judges 20:18 (ESV)

18 The people of Israel arose and went up to Bethel and inquired of God, “Who shall go up first for us to fight against the people of Benjamin?” And the LORD said, “Judah shall go up first.”

Bethel, a sacred site in salvation history, was 5 kilometres northwest of Mizpah, the place where the assembly was gathered at the start of the chapter.