Leviticus 25:50

then shall he calculate with his purchaser from the year that he sold himself to him until the year of release: and the money of his purchase shall be as that of a hireling, he shall be with him from year to year.

And he shall reckon with him that bought him from the year that he was sold to him unto the year of jubile: and the price of his sale shall be according unto the number of years, according to the time of an hired servant shall it be with him.

He shall reckon with him who bought him from the year that he sold himself to him to the Year of Jubilee. The price of his sale shall be according to the number of years; he shall be with him according to the time of a hired servant.