Cross reference
Genesis 35:23
23 Now Jacob had twelve sons: the sons of Leah: Reuben, Jacob's first son, and Simeon and Levi and Judah and Issachar and Zebulun;
Genesis 29:32-35
32 And Leah was with child, and gave birth to a son to whom she gave the name Reuben: for she said, The Lord has seen my sorrow; now my husband will have love for me.
33 Then she became with child again, and gave birth to a son; and said, Because it has come to the Lord's ears that I am not loved, he has given me this son in addition: and she gave him the name Simeon.
34 And she was with child again, and gave birth to a son; and said, Now at last my husband will be united to me, because I have given him three sons: so he was named Levi.
35 And she was with child again, and gave birth to a son: and she said, This time I will give praise to the Lord: so he was named Judah; after this she had no more children for a time.
Genesis 30:18-20
18 Then Leah said, God has made payment to me for giving my servant-girl to my husband: so she gave her son the name Issachar.
19 And again Leah became with child, and she gave Jacob a sixth son.
20 And she said, God has given me a good bride-price; now at last will I have my husband living with me, for I have given him six sons: and she gave him the name Zebulun.
Genesis 46:8-15
8 And these are the names of the children of Israel who came into Egypt, even Jacob and all his sons: Reuben, Jacob's oldest son;
9 And the sons of Reuben: Hanoch and Pallu and Hezron and Carmi;
10 And the sons of Simeon: Jemuel and Jamin and Ohad and Jachin and Zohar and Shaul, the son of a woman of Canaan;
11 And the sons of Levi: Gershon, Kohath, and Merari;
12 And the sons of Judah: Er and Onan and Shelah and Perez and Zerah: but Er and Onan had come to their death in the land of Canaan; and the sons of Perez were Hezron and Hamul.
13 And the sons of Issachar: Tola and Puah and Job and Shimron;
14 And the sons of Zebulun: Sered and Elon and Jahleel;
15 All these, together with his daughter Dinah, were the children of Leah, whom Jacob had by her in Paddan-aram; they were thirty-three in number.
Genesis 33:2
2 He put the servants and their children in front, Leah and her children after them, and Rachel and Joseph at the back.
Exodus 1:2-4
2 Reuben, Simeon, Levi, and Judah;
3 Issachar, Zebulun, and Benjamin;
4 Dan and Naphtali, Gad and Asher.