Deuteronomy 23:14-16 New King James Version (NKJV)

14. For the Lord your God walks in the midst of your camp, to deliver you and give your enemies over to you; therefore your camp shall be holy, that He may see no unclean thing among you, and turn away from you.

15. “You shall not give back to his master the slave who has escaped from his master to you.

16. He may dwell with you in your midst, in the place which he chooses within one of your gates, where it seems best to him; you shall not oppress him.

Deuteronomy 23