Nehemiah 10:30-33

30all join their brothers the nobles, and enter into a curse and an oath to walk in the Torah of God given through Moses the servant of God, and to keep and do all the mitzvot of Adonai our Lord, along with His ordinances and His statutes.

31“Furthermore, we will not give our daughters to the peoples of the land, and we will not take their daughters for our sons.

32When the peoples of the land bring merchandise or any kind of grain on Shabbat, we will not buy from them on Shabbat or on a holy day. Also every seventh year we will forego working the land and the debt of every hand.

33We also assume responsibility for the mitzvot to give a third of a shekel each year for the work of the House of our God: