2 Chronicles 11:21

And Rehoboam loved Maacah the daughter of Absalom more than all his wives and concubines (for he took eighteen wives and sixty concubines, and he fathered twenty-eight sons and sixty daughters).

Deuteronomy 17:17

And he must not {acquire many} wives for himself, so that his heart [would] turn aside; and {he must not accumulate silver and gold for himself excessively}.

2 Samuel 3:2-5

And sons [were] born to David in Hebron; his firstborn [was] Amnon by Ahinoam {from Jezreel}.

Judges 8:30

Now Gideon had seventy sons, {his own offspring}, for he had many wives.

2 Samuel 5:13

David took more concubines and wives from Jerusalem after he came from Hebron, and more sons and daughters [were] born to him.

1 Kings 11:3

He had seven hundred princesses and three hundred concubines, and his wives turned his heart.

1 Chronicles 3:1-9

These were the sons of David who were born to him in Hebron: the firstborn, Amnon, by Ahinoam the Jezreelite; the second, Daniel, by Abigail the Carmelite;

2 Chronicles 11:23

And he dealt wisely and distributed some of his sons throughout all the land of Judah and Benjamin, through all the fortified cities, and gave abundant provisions to them and obtained many wives [for them].

Song of Songs 6:8-9

Sixty queens there [are], eighty concubines, and maidens beyond number.

Treasury of Scripture Knowledge

Summary

And Rehoboam loved Maachah the daughter of Absalom above all his wives and his concubines: (for he took eighteen wives, and threescore concubines; and begat twenty and eight sons, and threescore daughters.)

Bible References

Eighteen wives

2 Chronicles 11:23
And he dealt wisely and distributed some of his sons throughout all the land of Judah and Benjamin, through all the fortified cities, and gave abundant provisions to them and obtained many wives [for them].
Deuteronomy 17:17
And he must not {acquire many} wives for himself, so that his heart [would] turn aside; and {he must not accumulate silver and gold for himself excessively}.
Judges 8:30
Now Gideon had seventy sons, {his own offspring}, for he had many wives.
2 Samuel 3:2
And sons [were] born to David in Hebron; his firstborn [was] Amnon by Ahinoam {from Jezreel}.
2 Samuel 5:13
David took more concubines and wives from Jerusalem after he came from Hebron, and more sons and daughters [were] born to him.
1 Kings 11:3
He had seven hundred princesses and three hundred concubines, and his wives turned his heart.
1 Chronicles 3:1
These were the sons of David who were born to him in Hebron: the firstborn, Amnon, by Ahinoam the Jezreelite; the second, Daniel, by Abigail the Carmelite;
Song of Songs 6:8
Sixty queens there [are], eighty concubines, and maidens beyond number.

General references

Deuteronomy 21:16
[nevertheless] {it will be the case that} on the day of bestowing his inheritance upon his sons, he will not be allowed to treat as [the] firstborn son the son of the beloved [wife] {in preference to} the son of the disliked [wife], [who is] the firstborn [son].
2 Samuel 5:13
David took more concubines and wives from Jerusalem after he came from Hebron, and more sons and daughters [were] born to him.
Song of Songs 6:8
Sixty queens there [are], eighty concubines, and maidens beyond number.