The beginning of verse 13 repeats the end of verse 12.

You shall not let him go empty-handed: to send them away without giving them something would only worsen their situation, since they had not earned any money during their time of servitude.

Quoted with permission from Bratcher, Robert G. and Hatton, Howard A. A Handbook on Deuteronomy. (UBS Helps for Translators). New York: UBS, 2000. For this and other handbooks for translators see here .