A sojourner or stranger - Rather, a foreigner who has settled among you. See Leviticus 16:29, note; Exodus 20:10, note.
In these years - More properly, by one of these means. The extreme period of servitude in this case was six years, as when the master was a Hebrew Exodus 21:2.
Looking at the law of the Jubilee from a simply practical point of view, its operation must have tended to remedy those evils which are always growing up in the ordinary conditions of human society. It prevented the permanent accumulation of land in the hands of a few, and periodically raised those whom fault or misfortune had sunk into poverty to a position of competency. It must also have tended to keep alive family feeling, and helped to preserve the family genealogies.
But in its more special character, as a law given by Yahweh to His special people, it was a standing lesson to those who would rightly regard it, on the terms upon which the enjoyment of the land of promise had been conferred upon them. All the land belonged to Yahweh as its supreme Lord, every Israelite as His vassal belonged to Him. The voice of the Jubilee horns, twice in every century, proclaimed the equitable and beneficent social order appointed for the people; they sounded that acceptable year of Yahweh which was to bring comfort to all that mourned, in which the slavery of sin was to be abolished, and the true liberty of God’s children was to be proclaimed Luke 2:25; Isaiah 61:2; Luke 4:19; Acts 3:21; Romans 8:19-23; 1 Peter 1:3-4.