2 Samuel 5:13
And David took him more concubines and wives out of Jerusalem, after he was come from Hebron: and there were yet sons and daughters born to David.
Nave's Topical Index

2 Samuel 15:16
And the king went forth, and all his household after him. And the king left ten women, which were concubines, to keep the house.
Nave's Topical Index

On the Government of God
... Concubinage, 107 f., 194 f.; laws concerning, 107n. Constans, Emperor, 144n, 170n. ...
David, instances of God's government in life of, 71ff., 129, 157, 204, 214. ...
//christianbookshelf.org/salvian/on the government of god/index 2.htm

Doctrinal and Moral Treatises. Index of Subjects.
... Head, [840]375; an heretical notion concerning, [841]389 ... Concubinage, for offspring's
sake unlawful, [904]406; was lawful ... 384, sought of God by David, [945]384 ...
/.../on care to be had for the dead /doctrinal and moral treatises index.htm

What is a concubine? Why did God allow men to have concubines in the Bible? | GotQuestions.org

How many wives did Abraham have? | GotQuestions.org

Concubinage: Dictionary and Thesaurus | Clyx.com

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