New Revised Standard Version
While Israel lived in that land, Reuben went and lay with Bilhah his father’s concubine; and Israel heard of it. Now the sons of Jacob were twelve.

Contemporary English Version
During their time there, Jacob's oldest son Reuben slept with Bilhah, who was one of Jacob's other wives. And Jacob found out about it.

New American Bible
While Israel was encamped in that region, Reuben went and lay with Bilhah, his father’s concubine. When Israel heard of it, he was greatly offended. The sons of Jacob were now twelve.

Douay-Rheims Bible
And when he dwelt in that country, Ruben went, and slept with Bala the concubine of his father: which he was not ignorant of. Now the sons of Jacob were twelve.

And when he dwelt in that country, Ruben went, and slept with Bala the concubine of his father: which he was not ignorant of. Now the sons of Jacob were twelve.

lay with.

Genesis 49:4 Thou art poured out as water, grow thou not; because thou wentest up to thy father's bed, and didst defile his couch.

Leviticus 18:8 Thou shalt not uncover the nakedness of thy father's wife: for it is the nakedness of thy father.

2 Samuel 16:21,22 And Achitophel said to Absalom: Go in to the concubines of thy father, whom he hath left to keep the house: that when all Israel shall hear that thou hast disgraced thy father, their hands may be strengthened with thee. . . .

2 Samuel 20:3 And when the king was come into his house at Jerusalem, he took the ten women his concubines, whom he had left to keep the house, and put them inward, allowing them provisions: and he went not in unto them, but they were shut up unto the day of their death living in widowhood.

1 Chronicles 5:1 Now the sons of Ruben the firstborn of Israel, (for he was his firstborn: but forasmuch as he defiled his father's bed, his first birthright was given to the sons of Joseph the son of Israel, and he was not accounted for the firstborn.

1 Corinthians 5:1 It is absolutely heard that there is fornication among you and such fornication as the like is not among the heathens: that one should have his father's wife.

Now the sons.

Genesis 35:18 And when her soul was departing for pain, and death was now at hand, she called the name of her son Benoni, that is, the son of my pain: but his father called him Benjamin, that is, the son of the right hand.

Genesis 29:31-35 And the Lord seeing that he despised Lia, opened her womb, but her sister remained barren. . . .

Genesis 30:5-24 When her husband had gone in unto her, conceived and bore a son. . . .

Genesis 46:8-27 And these are the names of the children of Israel, that entered into Egypt, he and his children. His firstborn Ruben, . . .

Genesis 49:1-28 And Jacob called his sons, and said to them: Gather yourselves together, that I may tell you the things that shall befall you in the last days. . . .

Exodus 1:1-5 These are the names of the children of Israel, that went into Egypt with Jacob: they went in every man with his household: . . .

Exodus 6:14-16 These are the heads of their houses by their families. The sons of Ruben the firstborn of Israel: Henoch and Phallu, Hesron and Charmi. . . .

Numbers 1:5-15 Whose names are these: Of Ruben, Elisur the son of Sedeur. . . .

Numbers 1:20 Of Ruben the eldest son of Israel, by their generations and families and houses and names of every head, all that were of the male sex, from twenty years old and upward, that were able to go forth to war,

*etc:

Numbers 2:3-33 On the east Juda shall pitch his tents by the bands of his army: and the prince of his sons; shall be Nahasson the son of Aminadab. . . .

Numbers 7:12 The first day Nahasson the son of Aminadab of the tribe of Juda offered his offering:

*etc:

Numbers 26:5-51,57-62 Ruben the firstborn of Israel. His sons were Henoch, of whom is the family of the Henochites: and Phallu, of whom is the family of the Phalluites: . . .

Numbers 34:14-28 For the tribe of the children of Ruben by their families, and the tribe of the children of Gad according to the number of their kindreds, and half of the tribe of Manasses, . . .

Deuteronomy 33:1-29 This is the blessing, wherewith the man of God, Moses, blessed the children of Israel, before his death. . . .

Joshua 13:1-21:45 Joshua was old, and far advanced in years, and the Lord said to him: Thou art grown old, and advanced in age, and there is a very large country left, which is not yet divided by lot: . . .

1 Chronicles 2:1,2 And these are the sons of Israel: Ruben, Simeon, Levi, Juda, Issachar, and Zabulon, . . .

1 Chronicles 12:23-40 And this is the number of the chiefs of the army who came to David, when he was in Hebron, to transfer to him the kingdom of Saul, according to the word of the Lord. . . .

1 Chronicles 27:16-22 Now the chiefs over the tribes of Israel were these: over the Rubenites, Eliezer the son of Zechri was ruler: over the Simeonites, Saphatias the son of Maacha: . . .

Ezekiel 48:1-35 And these are the names of the tribes from the borders of the north, by the way of Hethalon, as they go to Emath, the court of Enan the border of Damascus northward, by the way off Emath. And from the east side thereof to the sea shall be one portion for Dan. . . .

Acts 7:8 And he gave him the covenant of circumcision. And so he begot Isaac and circumcised him the eighth day: and Isaac begot Jacob: and Jacob, the twelve patriarchs.

Revelation 7:4-8 And I heard the number of them that were signed. An hundred forty-four thousand were signed, of every tribe of the children of Israel. . . .

Revelation 21:14 And the wall of the city had twelve foundations: And in them, the twelve names of the twelve apostles of the Lamb,