The Kitáb-i-Aqdas - The Most Holy Book
Index term: Servant, domestic
k63.
God hath prescribed matrimony unto you. Beware that ye take not unto yourselves more wives than two. Whoso contenteth himself with a single partner from among the maidservants of God, both he and she shall live in tranquillity. And he who would take into his service a maid may do so with propriety. Such is the ordinance which, in truth and justice, hath been recorded by the Pen of Revelation. Enter into wedlock, O people, that ye may bring forth one who will make mention of Me amid My servants. This is My bidding unto you; hold fast to it as an assistance to yourselves.
n90.
he who would take into his service a maid may do so with propriety
Bahá'u'lláh states that a man may employ a maiden for domestic service. This was not permissible under Shí'ih Muslim practice unless the employer entered into a marriage contract with her. Bahá'u'lláh emphasizes that the "service" referred to in this verse is solely "such as is performed by any other class of servants, be they young or old, in exchange for wages" (Q&A 30). An employer has no sexual rights over his maid. She is "free to choose a husband at whatever time she pleaseth", for the purchase of women is forbidden (Q&A 30).
q30.
 
Question: Concerning the verse: "he who would take into his service a maid may do so with propriety."
Answer: This is solely for service such as is performed by any other class of servants, be they young or old, in exchange for wages; such a maiden is free to choose a husband at whatever time she pleaseth, for it is forbidden either that women should be purchased, or that a man should have more wives than two.