Since having children in Judaism was considered a great blessing, legitimate wives often gave their maids to their husbands so they could have children with them when those women themselves were childless, as in the cases of Leah and Zilpah and Rachel and Bilhah. The concubine commanded the same respect and inviolability as the wife, and it was regarded as the deepest dishonor for the man to whom she belonged if hands were laid upon her. Even in the exceptional case of Sarah and Hagar, Abraham would have been obligated to treat Hagar as a full wife and she would have been treated as an equal by Abraham. Sarah's rights would have been regarding the technical legal status of being considered the inheritor and since the other wife and offspring would have been hers by ownership she became the legal albeit not biological mother of Ishmael.