Also see definition of "Concubinage" in Word Study
Study Dictionary
Concubinage
Concubinage [NAVE]
CONCUBINAGE.Laws Concerning
Ex. 21:7-11; Lev. 19:20-22; Deut. 21:10-14.
Concubines might be dismissed, Gen. 21:9-14.
Called Wives, Gen. 37:2; Judg. 19:3-5.
Children of, not heirs, Gen. 15:4; 21:10.
Practiced by Abraham, Gen. 16:3; 25:6; 1 Chr. 1:32; Nahor, Gen. 22:23, 24; Jacob, Gen. 30:4; Eliphaz, Gen. 36:12; Gideon, Judg. 8:31; a Levite, Judg. 19:1; Caleb, 1 Chr. 2:46-48; Manasseh, 1 Chr. 7:14; Saul, 2 Sam. 3:7; David, 2 Sam. 5:13; 15:16; Solomon, 1 Kin. 11:3; Rehoboam, 2 Chr. 11:21; Abijah, 2 Chr. 13:21; Belshazzar, Dan. 5:2.
See: Marriage; Polygamy.
Also see definition of "Concubinage" in Word Study