2 Chronicles 11:21

But Rehoboam loved Maachah, the daughter of Absalom, above all his wives and his concubines (for he took eighteen wives and sixty concubines and begat twenty-eight sons and sixty daughters.)

Deuteronomy 17:17

Neither shall he multiply wives unto himself, that his heart turn not away; neither shall he greatly multiply to himself silver or gold.

2 Samuel 3:2-5

And sons were born unto David in Hebron; and his firstborn was Amnon, of Ahinoam, the Jezreelitess;

Judges 8:30

And Gideon had seventy sons that came out of his loins, for he had many wives.

2 Samuel 5:13

And David took more concubines and wives out of Jerusalem after he had come from Hebron, and more sons and daughters were born unto David.

1 Kings 11:3

And he had seven hundred wives, princesses, and three hundred concubines; and his wives turned away his heart.

1 Chronicles 3:1-9

Now these were the sons of David, which were born unto him in Hebron: the firstborn, Amnon of Ahinoam, the Jezreelitess; the second, Daniel of Abigail of Carmel;

2 Chronicles 11:23

And he caused him to be instructed and dispersed of all his sons throughout all the lands of Judah and Benjamin, unto every fenced city; and he gave them provisions in abundance. And he desired many wives.

Song of Songs 6:8-9

There are sixty queens, and eighty concubines, and virgins 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 caused him to be instructed and dispersed of all his sons throughout all the lands of Judah and Benjamin, unto every fenced city; and he gave them provisions in abundance. And he desired many wives.
Deuteronomy 17:17
Neither shall he multiply wives unto himself, that his heart turn not away; neither shall he greatly multiply to himself silver or gold.
Judges 8:30
And Gideon had seventy sons that came out of his loins, for he had many wives.
2 Samuel 3:2
And sons were born unto David in Hebron; and his firstborn was Amnon, of Ahinoam, the Jezreelitess;
2 Samuel 5:13
And David took more concubines and wives out of Jerusalem after he had come from Hebron, and more sons and daughters were born unto David.
1 Kings 11:3
And he had seven hundred wives, princesses, and three hundred concubines; and his wives turned away his heart.
1 Chronicles 3:1
Now these were the sons of David, which were born unto him in Hebron: the firstborn, Amnon of Ahinoam, the Jezreelitess; the second, Daniel of Abigail of Carmel;
Song of Songs 6:8
There are sixty queens, and eighty concubines, and virgins without number.

General references

Deuteronomy 21:16
then it shall be, when he makes his sons to inherit that which he has, that he may not give the right of the firstborn unto the son of the beloved in preference over the son of the hated, who is indeed the firstborn;
2 Samuel 5:13
And David took more concubines and wives out of Jerusalem after he had come from Hebron, and more sons and daughters were born unto David.
Song of Songs 6:8
There are sixty queens, and eighty concubines, and virgins without number.