These were the sons of Reuben the firstborn of Israel. Though he was the firstborn, his birthright was given to the sons of Joseph son of Israel, because Reuben defiled his father's bed. So he is not reckoned according to birthright.
Cross References
Genesis 25:31"First sell me your birthright," Jacob replied.
Genesis 29:32And Leah conceived and gave birth to a son, and she named him Reuben, for she said, "The LORD has seen my affliction. Surely my husband will love me now."
Genesis 35:22While Israel was living in that region, Reuben went in and slept with his father's concubine Bilhah, and Israel heard about it. Jacob had twelve sons:
Genesis 48:5And now your two sons born to you in Egypt before I came to you here shall be reckoned as mine; Ephraim and Manasseh shall be mine, just as Reuben and Simeon are mine.
Genesis 48:15Then he blessed Joseph and said: "May the God before whom my fathers Abraham and Isaac walked, the God who has been my shepherd all my life to this day,
Genesis 49:4Uncontrolled as the waters, you will no longer excel, because you went up to your father's bed, onto my couch, and defiled it.
1 Chronicles 2:1These were the sons of Israel: Reuben, Simeon, Levi, Judah, Issachar, Zebulun,
Treasury of Scripture
Now the sons of Reuben the firstborn of Israel, (for he was the firstborn; but for as much as he defiled his father's bed, his birthright was given to the sons of Joseph the son of Israel: and the genealogy is not to be reckoned after the birthright.
A.
1 Chronicles 2:1
These are the sons of Israel; Reuben, Simeon, Levi, and Judah, Issachar, and Zebulun,
Genesis 29:32
And Leah conceived, and bare a son, and she called his name Reuben: for she said, Surely the LORD hath looked upon my affliction; now therefore my husband will love me.
Genesis 46:8
And these are the names of the children of Israel, which came into Egypt, Jacob and his sons: Reuben, Jacob's firstborn.
forasmuch.
Genesis 35:22
And it came to pass, when Israel dwelt in that land, that Reuben went and lay with Bilhah his father's concubine: and Israel heard it. Now the sons of Jacob were twelve:
Genesis 49:4
Unstable as water, thou shalt not excel; because thou wentest up to thy father's bed; then defiledst thou it: he went up to my couch.
Leviticus 18:8
The nakedness of thy father's wife shalt thou not uncover: it is thy father's nakedness.
birthright.
1 Chronicles 26:10
Also Hosah, of the children of Merari, had sons; Simri the chief, (for though he was not the firstborn, yet his father made him the chief;)
Genesis 48:15-22
And he blessed Joseph, and said, God, before whom my fathers Abraham and Isaac did walk, the God which fed me all my life long unto this day, …
Deuteronomy 21:17
But he shall acknowledge the son of the hated for the firstborn, by giving him a double portion of all that he hath: for he is the beginning of his strength; the right of the firstborn is his.
and.
Genesis 25:23
And the LORD said unto her, Two nations are in thy womb, and two manner of people shall be separated from thy bowels; and the one people shall be stronger than the other people; and the elder shall serve the younger.
1 Samuel 16:6-11
And it came to pass, when they were come, that he looked on Eliab, and said, Surely the LORD'S anointed is before him…
reckoned.
Joshua 14:6
Then the children of Judah came unto Joshua in Gilgal: and Caleb the son of Jephunneh the Kenezite said unto him, Thou knowest the thing that the LORD said unto Moses the man of God concerning me and thee in Kadeshbarnea.