Nehemiah 10:28-30

The rest of the people, priests, Levites, security guards, singers, Temple staff, and all who separated themselves from the foreign neighbors to keep The Revelation of God, together with their wives, sons, daughters—everyone old enough to understand—all joined their noble kinsmen in a binding oath to follow The Revelation of God given through Moses the servant of God, to keep and carry out all the commandments of GOD our Master, all his decisions and standards. Thus: We will not marry our daughters to our foreign neighbors nor let our sons marry their daughters.