Nehemiah 10:29-31

29all these now join their fellow Israelites the nobles, and bind themselves with a curse and an oath to follow the Law of God given through Moses the servant of God and to obey carefully all the commands, regulations and decrees of the Lord our Lord.

30“We promise not to give our daughters in marriage to the peoples around us or take their daughters for our sons.

31“When the neighboring peoples bring merchandise or grain to sell on the Sabbath, we will not buy from them on the Sabbath or on any holy day. Every seventh year we will forgo working the land and will cancel all debts.