2 Chronicles 11:21

But Rehoboam loved Maacah the daughter of Absalom above all his wives and concubines for he took eighteen wives and three score concubines, and begat three score daughters and twenty eight sons.

Deuteronomy 17:17

Also he shall not have too many wives, lest his heart turn away, neither shall he gather him silver and gold too much.

2 Samuel 3:2-5

And David had children born him in Hebron: his eldest son was Amnon of Ahinoam the Jezreelitess;

Judges 8:30

And Gideon had seventy sons of his body begotten, for he had many wives.

2 Samuel 5:13

And David took him more concubines and wives out of Jerusalem, after he was come from Hebron, and more sons and daughters were yet born to David.

1 Kings 11:3

And he had seven hundred very Queens and three hundred concubines which turned always his heart.

1 Chronicles 3:1-9

These are the sons of David which were born him in Hebron: the eldest Amnon, of Ahinoam the Jezreelitess. The second Daniel, by Abigail the Carmelitess.

2 Chronicles 11:23

And he played wisely and scattered of all his children throughout all the countries of Judah and Benjamin in every strong city. And he gave them abundance of victuals, and asked many wives.

Song of Songs 6:8-9

There are threescore Queens, and fourscore concubines, and young women without 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 played wisely and scattered of all his children throughout all the countries of Judah and Benjamin in every strong city. And he gave them abundance of victuals, and asked many wives.
Deuteronomy 17:17
Also he shall not have too many wives, lest his heart turn away, neither shall he gather him silver and gold too much.
Judges 8:30
And Gideon had seventy sons of his body begotten, for he had many wives.
2 Samuel 3:2
And David had children born him in Hebron: his eldest son was Amnon of Ahinoam the Jezreelitess;
2 Samuel 5:13
And David took him more concubines and wives out of Jerusalem, after he was come from Hebron, and more sons and daughters were yet born to David.
1 Kings 11:3
And he had seven hundred very Queens and three hundred concubines which turned always his heart.
1 Chronicles 3:1
These are the sons of David which were born him in Hebron: the eldest Amnon, of Ahinoam the Jezreelitess. The second Daniel, by Abigail the Carmelitess.
Song of Songs 6:8
There are threescore Queens, and fourscore concubines, and young women without number.

General references

Deuteronomy 21:16
if the firstborn be the son of the hated: then when he dealeth his goods among his children, he may not make the son of the beloved firstborn before the son of the hated which is indeed the firstborn:
2 Samuel 5:13
And David took him more concubines and wives out of Jerusalem, after he was come from Hebron, and more sons and daughters were yet born to David.
Song of Songs 6:8
There are threescore Queens, and fourscore concubines, and young women without number.