God repaid Abimelech for the evil he did to his father by murdering his seventy half-brothers.

The leaders of Gibeah attacked me and at night surrounded the house where I was staying. They wanted to kill me; instead they abused my concubine so badly that she died.

He did this so the violent deaths of Jerub-Baal’s seventy sons might be avenged and Abimelech, their half-brother who murdered them, might have to pay for their spilled blood, along with the leaders of Shechem who helped him murder them.