'Twelve' in the Bible

And all the years of Seth's life were nine hundred and twelve: and he came to his end.

For twelve years they were under the rule of Chedorlaomer, but in the thirteenth year they put off his control.

As for Ishmael, I have given ear to your prayer: truly I have given him my blessing and I will make him fertile and give him great increase; he will be the father of twelve chiefs, and I will make him a great nation.

These are the sons of Ishmael, and these are their names in their towns and their tent-circles; twelve chiefs with their peoples.

Now Jacob had twelve sons: the sons of Leah: Reuben, Jacob's first son, and Simeon and Levi and Judah and Issachar and Zebulun;

Then they said, We your servants are twelve brothers, sons of one man in the land of Canaan; the youngest of us is now with our father, and one is dead.

We are twelve brothers, sons of our father; one is dead, and the youngest is now with our father in the land of Canaan.

These are the twelve tribes of Israel: and these are the words their father said to them, blessing them; to every one he gave his blessing.