'Thirty' in the Bible
Also he made before the house two pillars of thirty and five cubits high, and the capital that was on the top of each of them was five cubits.
Also he made the molten sea of ten cubits from brim to brim, round in compass; and the height thereof was five cubits; and a line of thirty cubits compassed it round about.
And in the thirty and ninth year of his reign Asa was diseased in his feet; his disease was exceeding great: yet in his disease he sought not to Jehovah, but to the physicians.
And Jehoshaphat reigned over Judah: he was thirty and five years old when he began to reign; and he reigned twenty and five years in Jerusalem: and his mother's name was Azubah the daughter of Shilhi.
Jehoram was thirty and two years old when he began to reign; and he reigned eight years in Jerusalem.
Thirty and two years old was he when he began to reign, and he reigned in Jerusalem eight years: and he departed without being desired; and they buried him in the city of David, but not in the sepulchres of the kings.
But Jehoiada waxed old and was full of days, and he died; a hundred and thirty years old was he when he died.
Josiah was eight years old when he began to reign; and he reigned thirty and one years in Jerusalem.
And Josiah gave to the children of the people, of the flock, lambs and kids, all of them for the passover-offerings, unto all that were present, to the number of thirty thousand, and three thousand bullocks: these were of the king's substance.