Deuteronomy 21:11-13

11if you should see among them
Heb “the prisoners.” The pronoun has been used in the translation for stylistic reasons, to avoid redundancy.
an attractive woman whom you wish to take as a wife,
12you may bring her back to your house. She must shave her head,
This requirement for the woman to shave her head may symbolize the putting away of the old life and customs in preparation for being numbered among the people of the Lord. The same is true for the two following requirements.
trim her nails,
13discard the clothing she was wearing when captured,
Heb “she is to…remove the clothing of her captivity” (cf. NASB); NRSV “discard her captive’s garb.”
and stay
Heb “sit”; KJV, NASB, NRSV “remain.”
in your house, lamenting for her father and mother for a full month. After that you may have sexual relations
Heb “go unto,” a common Hebrew euphemism for sexual relations.
with her and become her husband and she your wife.
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