'Twelve' in the Bible

And all the days of Seth are nine hundred and twelve years, and he dieth.

twelve years they served Chedorlaomer, and the thirteenth year they rebelled.

As to Ishmael, I have heard thee; lo, I have blessed him, and made him fruitful, and multiplied him, very exceedingly; twelve princes doth he beget, and I have made him become a great nation;

these are sons of Ishmael, and these their names, by their villages, and by their towers; twelve princes according to their peoples.

And the sons of Jacob are twelve. Sons of Leah: Jacob's first-born Reuben, and Simeon, and Levi, and Judah, and Issachar, and Zebulun.

and they say, 'Thy servants are twelve brethren; we are sons of one man in the land of Canaan, and lo, the young one is with our father to-day, and the one is not.'

we are twelve brethren, sons of our father, the one is not, and the young one is to-day with our father in the land of Canaan.

All these are the twelve tribes of Israel, and this is that which their father hath spoken unto them, and he blesseth them; each according to his blessing he hath blessed them.