Vows Regarding Social and Economic Life

Nehemiah 10:30-31

and that we give not our daughters to the peoples of the land, and their daughters we take not to our sons;

and the peoples of the land who are bringing in the wares and any corn on the sabbath-day to sell, we receive not of them on the sabbath, and on a holy day, and we leave the seventh year, and usury on every hand.