'Twelve' in the Bible

So all the days of Seth were nine hundred and twelve years, and he died.

Twelve years they had served Chedorlaomer, but the thirteenth year they rebelled.

As for Ishmael, I have heard you; behold, I will bless him, and will make him fruitful and will multiply him exceedingly. He shall become the father of twelve princes, and I will make him a great nation.

These are the sons of Ishmael and these are their names, by their villages, and by their camps; twelve princes according to their tribes.

It came about while Israel was dwelling in that land, that Reuben went and lay with Bilhah his father’s concubine, and Israel heard of it.Now there were twelve sons of Jacob—

But they said, “Your servants are twelve brothers in all, the sons of one man in the land of Canaan; and behold, the youngest is with our father today, and one is no longer alive.”

We are twelve brothers, sons of our father; one is no longer alive, and the youngest is with our father today in the land of Canaan.’

All these are the twelve tribes of Israel, and this is what their father said to them when he blessed them. He blessed them, every one with the blessing appropriate to him.