2 Chronicles 11:21
And Rehoboam loved Maachah the daughter of Absalom above all his wives and his concubines: (for he took eighteen wives, and three score concubines; and begat twenty and eight sons, and three score daughters.)
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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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