'Thirty' in the Bible

And Adam lived an hundred and thirty years, and begat a son in his own likeness, after his image; and called his name Seth:

And all the days that Adam lived were nine hundred and thirty years: and he died.

And Mahalaleel lived after he begat Jared eight hundred and thirty years, and begat sons and daughters:

And this is the fashion which thou shalt make it of: The length of the ark shall be three hundred cubits, the breadth of it fifty cubits, and the height of it thirty cubits.

And Arphaxad lived five and thirty years, and begat Salah:

And Salah lived thirty years, and begat Eber:

And Eber lived four and thirty years, and begat Peleg:

And Eber lived after he begat Peleg four hundred and thirty years, and begat sons and daughters.

And Peleg lived thirty years, and begat Reu:

And Reu lived two and thirty years, and begat Serug:

And Serug lived thirty years, and begat Nahor:

And he said unto him, Oh let not the Lord be angry, and I will speak: Peradventure there shall thirty be found there. And he said, I will not do it, if I find thirty there.

And these are the years of the life of Ishmael, an hundred and thirty and seven years: and he gave up the ghost and died; and was gathered unto his people.

Thirty milch camels with their colts, forty kine, and ten bulls, twenty she asses, and ten foals.

And Joseph was thirty years old when he stood before Pharaoh king of Egypt. And Joseph went out from the presence of Pharaoh, and went throughout all the land of Egypt.

These be the sons of Leah, which she bare unto Jacob in Padanaram, with his daughter Dinah: all the souls of his sons and his daughters were thirty and three.

And Jacob said unto Pharaoh, The days of the years of my pilgrimage are an hundred and thirty years: few and evil have the days of the years of my life been, and have not attained unto the days of the years of the life of my fathers in the days of their pilgrimage.