Nehemiah 10:30-32

and that we would not give our daughters unto the people of the land, nor take their daughters for our sons: and if the people of the land bring ware or any victuals on the sabbath day to sell, that we would not buy it of them on the sabbath, or on the holy day: and that we would leave the seventh year, and the exaction of every debt. Also we made ordinances for us, to charge ourselves yearly with the third part of a shekel for the service of the house of our God