Leviticus 25:13

"In this year of Jubilee ye shall return every man unto his possession. And if thou sell aught unto thy neighbor, or buy of thy neighbor's hand, ye shall not wrong one another. According to the number of years after the jubilee thou shalt buy of thy neighbor, and according unto the number of years of the crops he shall sell unto thee. According to the multitude of the years thou shalt increase the price thereof, and according to the fewness of the years thou shalt diminish the price of it; for the number of crops doth he sell unto thee. And ye shall not wrong one another; but thou shalt fear thy God: for I am Jehovah your God."

These verses simply meant that buying or selling land applied only to the proportionate number of crops before the sabbatical year. The most that could be sold would be 49 crops, and after that the land with its increase reverted to the possessor whose rights were considered unalienable.