Nehemiah 10:29-31

29All these people joined with their leaders and they promised to obey the agreement. They agreed that God should punish them if they did not obey all of God's Law. That was the Law that God had given to his servant Moses. They promised very strongly to obey all the commands, rules and laws of the Lord, our Lord.

30They said, ‘We promise not to let our daughters marry the foreign people of this land. We will not let our sons marry their daughters.

31If foreign traders come to us on a Sabbath day, we will not buy their things. We will not buy their things on Sabbath days or on any special feast day. Every seventh year we will not plant any crops. We will also remove the debts of other people in every seventh year. They will not have to pay us back.