Leviticus 25:15-16

25:15 According to the number of years after the jubile thou shalt buy of thy neighbour, [and] according unto the number of years of the fruits he shall sell unto thee: 25:16 According to the multitude of years thou shalt increase the price thereof, and according to the fewness of years thou shalt diminish the price of it: for [according] to the number [of the years] of the fruits doth he sell unto thee.

Leviticus 25:27

25:27 Then let him count the years of the sale thereof, and restore the overplus unto the man to whom he sold it; that he may return unto his possession.

Leviticus 25:51-52

25:51 If [there be] yet many years [behind], according unto them he shall give again the price of his redemption out of the money that he was bought for. 25:52 And if there remain but few years unto the year of jubile, then he shall count with him, [and] according unto his years shall he give him again the price of his redemption.