Judges 12:9
“And he had thirty sons, and thirty daughters, whom he sent abroad, and took in thirty daughters from abroad for his sons. And he judged Israel seven years.”
And Jephthah judged Israel six years. Then died Jephthah the Gileadite, and was buried in one of the cities of Gilead.
And after him Ibzan of Beth–lehem judged Israel.
And he had thirty sons, and thirty daughters, whom he sent abroad, and took in thirty daughters from abroad for his sons. And he judged Israel seven years.
Then died Ibzan, and was buried at Beth–lehem.
And after him Elon, a Zebulonite, judged Israel; and he judged Israel ten years.
Counter-Arguments
The strongest case that this verse does not belong in this theme.

Cross-References
“And Gideon had threescore and ten sons of his body begotten: for he had many wives.”
“And he had forty sons and thirty nephews, that rode on threescore and ten ass colts: and he judged Israel eight years.”
“And he had thirty sons that rode on thirty ass colts, and they had thirty cities, which are called Havoth–jair unto this day, which are in the land of Gilead.”
“Let thy fountains be dispersed abroad, and rivers of waters in the streets.”
“Take ye wives, and beget sons and daughters; and take wives for your sons, and give your daughters to husbands, that they may bear sons and daughters; that ye may be increased there, and not diminished.”