Nehemiah 10:30-32

and that we would not give our daughters unto the peoples of the land, nor take their daughters for our sons; and if the peoples of the land bring wares or any grain on the sabbath day to sell, that we would not buy of them on the sabbath, or on a holy day; and that we would forego 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