Genesis 49:4

Unstable as water, you shall not excel [any longer], for you went up upon the bed of your father, then defiled [it]. You went up upon my couch!

Genesis 35:22

And while Israel was living in that land Reuben went and had sexual relations with Bilhah, his father's concubine. And Israel heard [about it].

Deuteronomy 27:20

'Cursed be the one who lies with the wife of his father, because {he has dishonored his father's bed}.' And all the people shall say, 'Amen.'

1 Chronicles 5:1

The sons of Reuben the firstborn of Israel (for he was the firstborn, but when he defiled the couch of his father, his birthright was given to the sons of Joseph, the son of Israel, so that he was not enrolled in the genealogy as the firstborn,

Genesis 46:8

Now these [are] the names of the sons of Israel, who came into Egypt, Jacob and his sons. Reuben, the firstborn of Jacob

Numbers 32:1-42

The descendants of Reuben and the descendants of Gad had a very large number of livestock. And they saw the land of Jazer and the land of Gilead, and behold it [was] a place for livestock.

Deuteronomy 5:21

'And you shall not covet the wife of your neighbor, and you shall not crave the house of your neighbor, his field or his slave or his slave woman or his ox and his donkey or anything {that belongs to your neighbor}.'

Deuteronomy 33:6

"May Reuben live, and may he not die, {and let his number not be few}."

1 Corinthians 5:1

It is reported everywhere [that there] is sexual immorality among you, and sexual immorality of such a kind which [does] not [even exist] among the Gentiles, so that someone has the wife of [his] father.

James 1:6-8

But let him ask for [it] in faith, without any doubting, for the one who doubts is like the surf of the sea, driven by the wind and tossed about.

2 Peter 2:14

having eyes full of [desire for] an adulteress and unceasing from sin, enticing unstable persons, [and] having hearts trained for greediness. Accursed children!

2 Peter 3:16

as [he does] also in all his letters, speaking in them about these [things], in which there are some [things] hard to understand, which the ignorant and unstable distort to their own destruction, as [they] also [do] the rest of the scriptures.

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 for [it] in faith, without any doubting, for the one who doubts is like the surf of the sea, driven by the wind and tossed about.
2 Peter 2:14
having eyes full of [desire for] an adulteress and unceasing from sin, enticing unstable persons, [and] having hearts trained for greediness. Accursed children!
2 Peter 3:16
as [he does] also in all his letters, speaking in them about these [things], in which there are some [things] hard to understand, which the ignorant and unstable distort to their own destruction, as [they] also [do] the rest of the scriptures.

Thou shalt not excel

Genesis 46:8
Now these [are] the names of the sons of Israel, who came into Egypt, Jacob and his sons. Reuben, the firstborn of Jacob
Deuteronomy 33:6
"May Reuben live, and may he not die, {and let his number not be few}."

Because

Genesis 35:22
And while Israel was living in that land Reuben went and had sexual relations with Bilhah, his father's concubine. And Israel heard [about it].
Deuteronomy 5:21
'And you shall not covet the wife of your neighbor, and you shall not crave the house of your neighbor, his field or his slave or his slave woman or his ox and his donkey or anything {that belongs to your neighbor}.'
Deuteronomy 27:20
'Cursed be the one who lies with the wife of his father, because {he has dishonored his father's bed}.' And all the people shall say, 'Amen.'
1 Chronicles 5:1
The sons of Reuben the firstborn of Israel (for he was the firstborn, but when he defiled the couch of his father, his birthright was given to the sons of Joseph, the son of Israel, so that he was not enrolled in the genealogy as the firstborn,
1 Corinthians 5:1
It is reported everywhere [that there] is sexual immorality among you, and sexual immorality of such a kind which [does] not [even exist] among the Gentiles, so that someone has the wife of [his] father.

General references

Leviticus 18:8
You must not expose the nakedness of your father's wife--it is your father's nakedness.
Numbers 1:20
The descendants of Reuben, the firstborn of Israel, their genealogies according to their clans, according to {their families}, according to [the] number of names, every male individually from {twenty years old} and above, everyone who [is able] to go to war:
Deuteronomy 27:20
'Cursed be the one who lies with the wife of his father, because {he has dishonored his father's bed}.' And all the people shall say, 'Amen.'
Deuteronomy 33:6
"May Reuben live, and may he not die, {and let his number not be few}."