Genesis 49:4

But because you were uncontrolled, the first place will not be yours; for you went up to your father's bed, even his bride-bed, and made it unclean.

Genesis 35:22

Now while they were living in that country, Reuben had connection with Bilhah, his father's servant-woman: and Israel had news of it.

Deuteronomy 27:20

Cursed is he who has sex relations with his father's wife, for he has put shame on his father. And let all the people say, So be it.

1 Chronicles 5:1

And the sons of Reuben, the oldest son of Israel, (for he was the oldest son, but, because he made his father's bride-bed unclean, his birthright was given to the sons of Joseph, the son of Israel; but he is not to be given the place of the oldest.

Genesis 46:8

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;

Numbers 32:1-42

Now the children of Reuben and the children of Gad had a great number of cattle: and when they saw that the land of Jazer and the land of Gilead was a good place for cattle;

Deuteronomy 5:21

Or let your desire be turned to your neighbour's wife, or his house or his field or his man-servant or his woman-servant or his ox or his ass or anything which is your neighbour's.

Deuteronomy 33:6

Let life not death be Reuben's, let not the number of his men be small.

1 Corinthians 5:1

It is said, in fact, that there is among you a sin of the flesh, such as is not seen even among the Gentiles, that one of you has his father's wife.

James 1:6-8

Let him make his request in faith, doubting nothing; for he who has doubt in his heart is like the waves of the sea, which are troubled by the driving of the wind.

2 Peter 2:14

Having eyes full of evil desire, never having enough of sin; turning feeble souls out of the true way; they are children of cursing, whose hearts are well used to bitter envy;

2 Peter 3:16

And as he said in all his letters, which had to do with these things; in which are some hard sayings, so that, like the rest of the holy Writings, they are twisted by those who are uncertain and without knowledge, to the destruction of their souls.

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
Let him make his request in faith, doubting nothing; for he who has doubt in his heart is like the waves of the sea, which are troubled by the driving of the wind.
2 Peter 2:14
Having eyes full of evil desire, never having enough of sin; turning feeble souls out of the true way; they are children of cursing, whose hearts are well used to bitter envy;
2 Peter 3:16
And as he said in all his letters, which had to do with these things; in which are some hard sayings, so that, like the rest of the holy Writings, they are twisted by those who are uncertain and without knowledge, to the destruction of their souls.

Thou shalt not excel

Genesis 46:8
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;
Deuteronomy 33:6
Let life not death be Reuben's, let not the number of his men be small.

Because

Genesis 35:22
Now while they were living in that country, Reuben had connection with Bilhah, his father's servant-woman: and Israel had news of it.
Deuteronomy 5:21
Or let your desire be turned to your neighbour's wife, or his house or his field or his man-servant or his woman-servant or his ox or his ass or anything which is your neighbour's.
Deuteronomy 27:20
Cursed is he who has sex relations with his father's wife, for he has put shame on his father. And let all the people say, So be it.
1 Chronicles 5:1
And the sons of Reuben, the oldest son of Israel, (for he was the oldest son, but, because he made his father's bride-bed unclean, his birthright was given to the sons of Joseph, the son of Israel; but he is not to be given the place of the oldest.
1 Corinthians 5:1
It is said, in fact, that there is among you a sin of the flesh, such as is not seen even among the Gentiles, that one of you has his father's wife.

General references

Leviticus 18:8
And you may not have sex relations with your father's wife: she is your father's.
Numbers 1:20
The generations of the sons of Reuben, the oldest son of Israel, were numbered by their families and their fathers' houses, every male of twenty years old and over, who was able to go to war;
Deuteronomy 27:20
Cursed is he who has sex relations with his father's wife, for he has put shame on his father. And let all the people say, So be it.
Deuteronomy 33:6
Let life not death be Reuben's, let not the number of his men be small.

Basic English, produced by Mr C. K. Ogden of the Orthological Institute - public domain