A woman, often a servant or slave, with whom a man had regular sexual relations, but to whom he was not married. A concubine did not have the rights of a wife and her children were not rightful heirs, though a wife might offer a servant to her husband as a concubine to have children on her behalf.
Concubines and wives
Maidservants were given as concubines Ge 30:3-6 Bilhah’s sons would be regarded by Rachel as her own and would thus share the inheritance with Jacob’s other sons. See also Ge 30:9; Ge 16:1-2; Gal 4:22-23
Concubines were a symbol of possession
Taking the concubine(s) of a king was tantamount to laying claim to the kingdom 2Sa 3:7 Abner is accused here of trying to usurp Ish-Bosheth’s inheritance. See also 2Sa 12:8; 2Sa 16:21-22; 1Ki 2:21-22
Further examples of concubines
Ge 22:23-24 Nahor’s concubine, Reumah; Ge 36:12 Eliphaz’concubine, Timna; Jdg 19:1 a Levite’s concubine; 2Sa 15:16 David’s concubines; 1Ch 1:32 Abraham’s concubine, Keturah; 1Ch 2:46-48 Caleb’s concubines, Ephah and Maacah; 1Ch 7:14 Manasseh’s concubine; Est 2:14 Xerxes’concubines; Da 5:23 Belshazzar’s concubines