"If he did not designate her [for himself], then he shall enable her to be redeemed"—Exodus 21:8.

It is a [non-binding] mitzvah for the master of a Jewish maidservant to marry her [if she consents], or to wed her to his son. This mitzvah takes precedence over the master's obligation to allow for the maidservants redemption.

This mitzvah, along with all the mitzvot that apply to Jewish bondspeople, only apply while the Jubilee is practiced in the Holy Land.