Exodus 21:2-4

New Revised Standard Version, Anglicised

² When you buy a male Hebrew slave, he shall serve for six years, but in the seventh he shall go out a free person, without debt. ³ If he comes in single, he shall go out single; if he comes in married, then his wife shall go out with him. ⁴ If his master gives him a wife and she bears him sons or daughters, the wife and her children shall be her master’s and he shall go out alone.