Exodus 21:2-7

2If thou buy a Hebrew servant, six years he shall serve: and in the seventh he shall go out free for nothing. 3If he come in by himself, he shall go out by himself: if he be married, then his wife shall go out with him. 4If his master give him a wife and she bear him sons or daughters; the wife and her children shall be her master’s, and he shall go out by himself. 5But if the servant shall plainly say, I love my master, my wife, and my children; I will not go out free: 6then his master shall bring him unto God, and shall bring him to the door, or unto the door-post; and his master shall bore his ear through with an awl; and he shall serve him for ever.

7And if a man sell his daughter to be a maid-servant, she shall not go out as the men-servants do.