'Concubines' in the Bible

{When he tasted the wine}, Belshazzar commanded [that they] bring [the] vessels of gold and silver that Nebuchadnezzar his {predecessor} had taken from the temple that [was] in Jerusalem, so that the king and his lords, his wives and his concubines may drink from them.

Then they brought in the vessels of gold that they took from the temple, the house of God that [was] in Jerusalem, and the king and his lords, his wives and his concubines drank from them.

And [now] you have exalted yourself against the Lord of heaven, and the vessels of his temple you have brought in before you, and you and your lords, your wives and your concubines, have been drinking wine from them, and you have praised the gods of silver, gold, bronze, iron, wood, and stone that [do] not see and [do] not hear and [do] not know, but the God {who holds your life in his hand} and all of your ways {come from him}, you have not honored.