Judges 9:18

9:18 But you have attacked my father’s family today. You murdered his seventy legitimate sons on one stone and made Abimelech, the son of his female slave, king over the leaders of Shechem, just because he is your close relative.

Judges 12:9

12:9 He had thirty sons. He arranged for thirty of his daughters to be married outside his extended family, and he arranged for thirty young women to be brought from outside as wives for his sons. Ibzan led Israel for seven years;