'Thirty' in the Bible
And he had thirty sons, who went on thirty young asses; and they had thirty towns in the land of Gilead, which are named Havvoth-Jair to this day.
He had thirty sons, and thirty daughters whom he sent to other places, and he got thirty wives from other places for his sons. And he was judge of Israel for seven years.
He had forty sons and thirty sons' sons who went on seventy young asses; and he was judge of Israel for eight years.
And Samson said, Now I have a hard question for you: if you are able to give me the answer before the seven days of the feast are over, I will give you thirty linen robes and thirty changes of clothing;
But if you are not able to give me the answer, then you will have to give me thirty linen robes and thirty changes of clothing. And they said to him, Put your hard question and let us see what it is.
And the spirit of the Lord came rushing on him, and he went down to Ashkelon and, attacking thirty men there, took their clothing from them, and gave it to the men who had given the answer to his hard question. Then, full of wrath, he went back to his father's house.
And the children of Benjamin went out against the people, moving away from the town; and as before, at their first attack, they put to death about thirty men of Israel on the highways, of which one goes up to Beth-el and the other to Gibeah, and in the open country.
The men of Israel were to make a turn about in the fight. And Benjamin had overcome and put to death about thirty of the men of Israel, and were saying, Certainly they are falling back before us as in the first fight.