Nehemiah 10:29-31

29join with their noble brothers and commit themselves with a sworn oath to follow the law of God given through God’s servant Moses and to obey carefully all the commands, ordinances, and statutes of the Lord our Lord.

30We will not give our daughters in marriage to the surrounding peoples and will not take their daughters as wives for our sons.

31When the surrounding peoples bring merchandise or any kind of grain to sell on the Sabbath day, we will not buy from them on the Sabbath or a holy day. We will also leave the land uncultivated in the seventh year and will cancel every debt.