Exodus 21:2-4

New Century Version

² “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. ³ 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. ⁴ 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.