Judges 8:31

And his concubine that was in Shechem, she also bare him a son, whose name he called Abimelech.

This verse belongs to the account of Gideon, whom God raised up to deliver Israel from its enemies. That deliverance was from Midianite oppression and came after the people confessed their sins. The account illustrates the repeated pattern that after a deliverer died, the people gradually returned to idolatry.