A concubine was a second-class wife. In societies where polygamy was common, people could buy a concubine, acquire one as debt repayment, or take one in war. Sometimes, a concubine was added to compensate for a deficiency in a legitimate wife (for example, Genesis 16:1–4; 30:3–13; 35:22). However, in the case of the Levite, there seems to have been no other wife.