Exodus 21:2-6

“If you buy a Hebrew slave, he will serve you for six years. In the seventh year you are to set him free, and he will have to pay nothing. If he is not married when he becomes your slave, he must leave without a wife. But if he is married when he becomes your slave, he may take his wife with him. If the slave’s master gives him a wife, and she gives birth to sons or daughters, the woman and her children will belong to the master. When the slave is set free, only he may leave. “But if the slave says, ‘I love my master, my wife and my children, and I don’t want to go free,’ then the slave’s master must take him to God. The master is to take him to a door or doorframe and punch a hole through the slave’s ear using a sharp tool. Then the slave will serve that master all his life.