Cross reference
Judges 12:14
14 And he had forty sons and thirty sons' sons, that rode on threescore and ten ass colts: and he judged Israel eight years.
Judges 5:10
10 Tell `of it', ye that ride on white asses, Ye that sit on rich carpets, And ye that walk by the way.
Judges 10:4
4 And he had thirty sons that rode on thirty ass colts, and they had thirty cities, which are called Havvoth-jair unto this day, which are in the land of Gilead.