Genesis 49:4

As unstable as water wast thou: thou shalt therefore not be the chiefest, for thou wentest up upon thy father's bed, and then defiledest thou my couch with going up.

Genesis 35:22

And it chanced, as Israel dwelt in that land, that Reuben went and lay with Bilhah his father's concubine, and it came to Israel's ear. The sons of Jacob were twelve in number.

Deuteronomy 27:20

"'Cursed be he that lieth with his father's wife, because he hath opened his father's covering.' And all the people shall say, 'Amen.'

1 Chronicles 5:1

The sons of Reuben, the eldest son of Israel: for he was the eldest. But because he defied his father's bed, his birthright was given unto the sons of Joseph, the son of Israel, and so he is not reckoned unto the birthright.

Genesis 46:8

These are the names of the children of Israel which came into Egypt, both Jacob and his sons: Reuben, Jacob's first son.

Numbers 32:1-42

The children of Reuben and the children of Gad had an exceeding great multitude of cattle. And when they saw the land of Jazer and the land of Gilead, that it was an apt place for cattle,

Deuteronomy 5:21

'Thou shalt not lust after thy neighbour's wife: thou shalt not covet thy neighbour's house, field, servant, maid, ox, ass nor ought that is thy neighbour's.'

Deuteronomy 33:6

Reuben shall live and shall not die: but his people shall be few in number. This is the blessing of Judah."

1 Corinthians 5:1

There goeth a common saying that there is fornication among you, and such fornication as is not once named among the gentiles: that one should have his father's wife.

James 1:6-8

But let him ask in faith, and waver not. For he that doubteth is like the waves of the sea, tossed of the wind, and carried with violence.

2 Peter 2:14

having eyes full of adultery, and that cannot cease to sin, beguiling unstable souls. Hearts they have exercised with covetousness. They are cursed children,

2 Peter 3:16

yea, almost in every epistle, speaking of such things: among which are many things hard to be understood: which they that are unlearned and unstable pervert, as they do other scriptures, unto their own destruction.

Treasury of Scripture Knowledge

Summary

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.

Thou shalt not excel

Bible References

Unstable

James 1:6
But let him ask in faith, and waver not. For he that doubteth is like the waves of the sea, tossed of the wind, and carried with violence.
2 Peter 2:14
having eyes full of adultery, and that cannot cease to sin, beguiling unstable souls. Hearts they have exercised with covetousness. They are cursed children,
2 Peter 3:16
yea, almost in every epistle, speaking of such things: among which are many things hard to be understood: which they that are unlearned and unstable pervert, as they do other scriptures, unto their own destruction.

Thou shalt not excel

Genesis 46:8
These are the names of the children of Israel which came into Egypt, both Jacob and his sons: Reuben, Jacob's first son.
Deuteronomy 33:6
Reuben shall live and shall not die: but his people shall be few in number. This is the blessing of Judah."

Because

Genesis 35:22
And it chanced, as Israel dwelt in that land, that Reuben went and lay with Bilhah his father's concubine, and it came to Israel's ear. The sons of Jacob were twelve in number.
Deuteronomy 5:21
'Thou shalt not lust after thy neighbour's wife: thou shalt not covet thy neighbour's house, field, servant, maid, ox, ass nor ought that is thy neighbour's.'
Deuteronomy 27:20
"'Cursed be he that lieth with his father's wife, because he hath opened his father's covering.' And all the people shall say, 'Amen.'
1 Chronicles 5:1
The sons of Reuben, the eldest son of Israel: for he was the eldest. But because he defied his father's bed, his birthright was given unto the sons of Joseph, the son of Israel, and so he is not reckoned unto the birthright.
1 Corinthians 5:1
There goeth a common saying that there is fornication among you, and such fornication as is not once named among the gentiles: that one should have his father's wife.

General references

Leviticus 18:8
The privities of thy father's wife shalt thou not uncover, for they are thy father's privities.
Numbers 1:20
And the children of Reuben, Israel's eldest son, in their generations, kindreds and houses of their fathers - when they were numbered every man by name, all that were males from twenty years and above, as many as were able to go forth in war -
Deuteronomy 27:20
"'Cursed be he that lieth with his father's wife, because he hath opened his father's covering.' And all the people shall say, 'Amen.'
Deuteronomy 33:6
Reuben shall live and shall not die: but his people shall be few in number. This is the blessing of Judah."