Leviticus 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."
Cross References (ranked by relevance)
Leviticus 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.
Leviticus 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.