2 Chronicles 11:21

And Rehoboam loveth Maachah daughter of Absalom above all his wives and his concubines -- for eighteen wives he hath taken, and sixty concubines -- and he begetteth twenty and eight sons, and sixty daughters.

Deuteronomy 17:17

And he doth not multiply to himself wives, and his heart doth not turn aside, and silver and gold he doth not multiply to himself -- exceedingly.

2 Samuel 3:2-5

And there are born to David sons in Hebron, and his first-born is Amnon, of Ahinoam the Jezreelitess,

Judges 8:30

and to Gideon there have been seventy sons, coming out of his loin, for he had many wives;

2 Samuel 5:13

And David taketh again concubines and wives out of Jerusalem, after his coming from Hebron, and there are born again to David sons and daughters.

1 Kings 11:3

And he hath women, princesses, seven hundred, and concubines three hundred; and his wives turn aside his heart.

1 Chronicles 3:1-9

And these were sons of David, who were born to him in Hebron: the first-born Amnon, of Ahinoam the Jezreelitess; second Daniel, of Abigail the Carmelitess;

2 Chronicles 11:23

And he hath understanding, and spreadeth out of all his sons to all lands of Judah and Benjamin, to all cities of the bulwarks, and giveth to them provision in abundance; and he asketh a multitude of wives.

Song of Songs 6:8-9

Sixty are 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 hath understanding, and spreadeth out of all his sons to all lands of Judah and Benjamin, to all cities of the bulwarks, and giveth to them provision in abundance; and he asketh a multitude of wives.
Deuteronomy 17:17
And he doth not multiply to himself wives, and his heart doth not turn aside, and silver and gold he doth not multiply to himself -- exceedingly.
Judges 8:30
and to Gideon there have been seventy sons, coming out of his loin, for he had many wives;
2 Samuel 3:2
And there are born to David sons in Hebron, and his first-born is Amnon, of Ahinoam the Jezreelitess,
2 Samuel 5:13
And David taketh again concubines and wives out of Jerusalem, after his coming from Hebron, and there are born again to David sons and daughters.
1 Kings 11:3
And he hath women, princesses, seven hundred, and concubines three hundred; and his wives turn aside his heart.
1 Chronicles 3:1
And these were sons of David, who were born to him in Hebron: the first-born Amnon, of Ahinoam the Jezreelitess; second Daniel, of Abigail the Carmelitess;
Song of Songs 6:8
Sixty are queens, and eighty concubines, And virgins without number.

General references

Deuteronomy 21:16
then it hath been, in the day of his causing his sons to inherit that which he hath, he is not able to declare first-born the son of the loved one, in the face of the son of the hated one -- the first-born.
2 Samuel 5:13
And David taketh again concubines and wives out of Jerusalem, after his coming from Hebron, and there are born again to David sons and daughters.
Song of Songs 6:8
Sixty are queens, and eighty concubines, And virgins without number.