Judges 8:31
And his concubine that was in Shechem, she also bare him a son, whose name he called Abimelech.
Cross-reference
Judges 9:1–5
Historical context
Judges 9:1-5 recounts Abimelech, son of Gideon's concubine, murdering his 70 half-brothers — the direct consequence of Gideon's polygamy.
Judges 9:18
Historical context
Judges 9:18 refers back to Abimelech, son of Gideon's concubine, killing his 70 brothers — reinforcing the tragic outcome.