Leviticus 27:21-25

and when it reverts in the jubilee, the field shall be holy to the Lord, like a field banned from secular use; it shall be for the priest as his property.

Or if he consecrates to the Lord a field which he has bought, which is not a part of the field of his own property,

then the priest shall calculate for him the amount of your assessment up to the year of jubilee; and he shall on that day give your assessment as holy to the Lord.

In the year of jubilee the field shall return to the one from whom he bought it, to whom the possession of the land belongs.

Every assessment of yours, moreover, shall be by the shekel of the sanctuary. The shekel shall be twenty gerahs.