Read Deuteronomy 21:13 Using Other Translations
And she shall put the raiment of her captivity from off her, and shall remain in thine house, and bewail her father and her mother a full month: and after that thou shalt go in unto her, and be her husband, and she shall be thy wife.
And she shall take off the clothes in which she was captured and shall remain in your house and lament her father and her mother a full month. After that you may go in to her and be her husband, and she shall be your wife.
and change the clothes she was wearing when she was captured. She will stay in your home, but let her mourn for her father and mother for a full month. Then you may marry her, and you will be her husband and she will be your wife.