Genesis 29:33

the sons of Leah: Reuben, Jacob’s firstborn, then Simeon and Levi and Judah and Issachar and Zebulun;

“Of the tribe of the sons of Simeon, Samuel the son of Ammihud.

“If a man has two wives, the one loved and the other unloved, and both the loved and the unloved have borne him sons, if the firstborn son belongs to the unloved,

“And He gave him the covenant of circumcision; and so Abraham was the father of Isaac, and circumcised him on the eighth day; and Isaac was the father of Jacob, and Jacob of the twelve patriarchs.