'Concubines' in the Bible

but to the sons of his concubines [Hagar and Keturah], Abraham gave gifts while he was still living and he sent them to the east country, away from Isaac his son [of promise].

David took more concubines and wives from Jerusalem, after he came from Hebron; and more sons and daughters were born to him.

So the king left, and all his household with him. But the king left behind ten women who were concubines to take care of the house (palace).

Ahithophel said to Absalom, “Go in to your father’s concubines, whom he has left behind to take care of the house; then all Israel will hear that you have made yourself odious to your father. Then the hands of all who are with you will be strengthened [by your boldness and audacity].”

Then Joab came into the house to the king and said, “Today you have put all your servants to shame who this day have saved your life and the lives of your sons and your daughters, and the lives of your wives and concubines.

Then David came to his house (palace) at Jerusalem, and the king took the ten women, his concubines whom he had left to take care of the house, and placed them under guard and provided for them, but did not go in to them. So they were confined, and lived as widows until the day of their death.

He had seven hundred wives, princesses, and three hundred concubines, and his wives turned his heart away [from God].

All these were the sons of David, besides the sons of the concubines; and Tamar was their sister.

Rehoboam loved Maacah the daughter (granddaughter) of Absalom more than all his wives and concubines—for he had taken eighteen wives and sixty concubines, and he fathered twenty-eight sons and sixty daughters.

In the evening she would go in and the next morning she would return to the second harem, to the custody of Shaashgaz, the king’s eunuch who was in charge of the concubines. She would not return to the king unless he delighted in her and she was summoned by name.

Also, I collected for myself silver and gold and the treasure of kings and provinces. I provided for myself male singers and female singers, and the delights and pleasures of men—many concubines.

“There are sixty queens and eighty concubines,And maidens without number;

But my dove, my perfect one, stands alone [above them all];She is her mother’s only daughter;She is the pure child of the one who bore her.The maidens saw her and called her blessed and happy,The queens and the concubines also, and they praised her, saying,

Belshazzar, as he tasted the wine, gave a command to bring in the gold and silver vessels which his father Nebuchadnezzar had taken out of the temple which was in Jerusalem, so that the king and his nobles, his wives and his concubines might drink from them.

Then they brought in the gold and silver vessels that had been taken out of the temple, the house of God which was in Jerusalem; and the king and his nobles, his wives and his concubines drank from them.

And you have exalted yourself against the Lord of heaven, and the vessels of His house have been brought before you, and you and your nobles, your wives and your concubines have been drinking wine from them; and you have praised the gods of silver and gold, of bronze, iron, wood and stone, which do not see or hear or understand. But the God who holds in His hand your breath of life and your ways you have not honored and glorified [but have dishonored and defied].