1 Kings 11:3
"And he had seven hundred wives, princesses, and three hundred concubines: and his wives turned away his heart."
Cross References (ranked by relevance)
Ecclesiastes 7:28
Which yet my soul seeketh, but I find not: one man among a thousand have I found; but a woman among all those have I not found.
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 threescore concubines; and begat twenty and eight sons, and threescore daughters.)
Judges 9:5
And he went unto his father’s house at Ophrah, and slew his brethren the sons of Jerubbaal, being threescore and ten persons, upon one stone: notwithstanding yet Jotham the youngest son of Jerubbaal was left; for he hid himself.