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;

Judges 14:12

14:12 Samson said to them, “I will give you a riddle. If you really can solve it during the seven days the party lasts, I will give you thirty linen robes and thirty sets of clothes.

Judges 14:17

14:17 She cried on his shoulder until the party was almost over. Finally, on the seventh day, he told her because she had nagged him so much. Then she told the young men the solution to the riddle.