Leviticus 25:53-55

⁵³as a hireling; he shall be with him from year to year; thou shalt not oppress him with labour before thee.

⁵⁴And if he do not pay his ransom accordingly, he shall go out in the year of his release, he and his children with him.

⁵⁵For the children of Israel are my servants: they are my attendants, whom I brought out of the land of Egypt.