Exodus 21:1-5

Now these are the ordinances which thou shalt set before them. If thou buy a Hebrew servant, six years he shall serve: and in the seventh he shall go out free for nothing. If he come in by himself, he shall go out by himself: if he be married, then his wife shall go out with him. If 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. But if the servant shall plainly say, I love my master, my wife, and my children; I will not go out free