'Concubines' in the Bible

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.

And the king goeth out, and all his household at his feet, and the king leaveth ten women -- concubines -- to keep the house.

And Ahithophel saith unto Absalom, 'Go in unto the concubines of thy father, whom he left to keep the house, and all Israel hath heard that thou hast been abhorred by thy father, and the hands of all who are with thee have been strong.'

And they spread out for Absalom the tent on the roof, and Absalom goeth in unto the concubines of his father before the eyes of all Israel.

And Joab cometh in unto the king to the house, and saith, 'Thou hast put to shame to-day the faces of all thy servants, those delivering thy life to-day, and the life of thy sons, and of thy daughters, and the life of thy wives, and the life of thy concubines,