If thou buy an Hebrew servant, six years he shall serve: and in the seventh he shall go out free for {a} nothing.

(a) Paying no money for his freedom.

Wesley's Notes

21:2 If thou buy an Hebrew servant - Either sold by him or his parents through poverty, or by the judges for his crimes, yet even such a one was to continue in slavery but seven years at the most.

Jamieson-Fausset-Brown Bible Commentary

2-6. If thou buy an Hebrew servant-Every Israelite was free-born; but slavery was permitted under certain restrictions. An Hebrew might be made a slave through poverty, debt, or crime; but at the end of six years he was entitled to freedom, and his wife, if she had voluntarily shared his state of bondage, also obtained release. Should he, however, have married a female slave, she and the children, after the husband's liberation, remained the master's property; and if, through attachment to his family, the Hebrew chose to forfeit his privilege and abide as he was, a formal process was gone through in a public court, and a brand of servitude stamped on his ear (Ps 40:6) for life, or at least till the Jubilee (De 15:17).

Matthew Henry's Concise Commentary

21:1-11 The laws in this chapter relate to the fifth and sixth commandments; and though they differ from our times and customs, nor are they binding on us, yet they explain the moral law, and the rules of natural justice. The servant, in the state of servitude, was an emblem of that state of bondage to sin, Satan, and the law, which man is brought into by robbing God of his glory, by the transgression of his precepts. Likewise in being made free, he was an emblem of that liberty wherewith Christ, the Son of God, makes free from bondage his people, who are free indeed; and made so freely, without money and without price, of free grace.