Leviticus 25:40

But let him be with you as a servant working for payment, till the year of Jubilee;

Exodus 21:2-3

If you get a Hebrew servant for money, he is to be your servant for six years, and in the seventh year you are to let him go free without payment.

Treasury of Scripture Knowledge did not add

Basic English, produced by Mr C. K. Ogden of the Orthological Institute - public domain