Judges 11:18
Then they went along through the wilderness, and compassed the land of Edom, and the land of Moab, and came by the east side of the land of Moab, and pitched on the other side of Arnon, but came not within the border of Moab: for Arnon was the border of Moab.
Cross-reference
Numbers 20:22 shows the departure from Kadesh to Mount Hor, the first leg of the journey around Edom that Jephthah describes.
Numbers 21:10-13 traces the route around Moab to the Arnon, matching Jephthah's summary of camping beyond Moab's border.
Numbers 21:13 specifies camping on the other side of the Arnon, the very location Jephthah says they reached without entering Moab.
Numbers 33:37-44 lists the stages from Kadesh past Mount Hor and on to the Arnon, paralleling Jephthah's itinerary.
Deuteronomy 2:1-8 recounts the detour around Edom and Moab, directly echoing Jephthah's description of the journey.
Numbers 20:21 records Edom's refusal to let Israel pass — the same event Jephthah references as part of his historical summary.
Deuteronomy 2:8 describes Israel turning away from Edom after their refusal — the same route Jephthah summarizes here.
Joshua 12:1 lists the conquered kings east of the Jordan — the same territory Jephthah references as Israel's possession.
Numbers 21:4 begins with the turn around Edom that Jephthah references, though the passage then shifts to the serpent incident.
Numbers 21:11 records the camp at Iye-abarim opposite Moab, one stop in the journey Jephthah summarizes.
Deuteronomy 2:24 commands Israel to engage Sihon in battle — the next step after the Edom detour Jephthah recounts.