Jacob’s 12 sons became the leaders of the tribes of Israel. Look at the order of Jacob’s children and the mother of each child.

LEAH ZIPAH
(Leah’s servant)
BILHAH
(Rachel’s servant)
RACHEL
Reuben (1) Gad (7) Dan (5) Joseph (12)
Simeon (2) Asher (8) Naphtali (6) Benjamin (13)
Levi (3)      
Judah (4)      
Issachar (9)      
Zebulun (10)      
Dinah (11)      

Note: The numbers after Jacob’s children’s names indicate their birth order as given in Genesis 29—30; 35:16-26. See the mini-article called “Israel” for more about how the tribes of Israel were descended from Jacob’s twelve sons.