Leviticus 25:14-17

Verse 14

Ye shall not oppress one another - Ye shall take no advantage of each other's ignorance either in buying or selling; for he that buys an article at less than it is worth, or sells one for more than it is worth, taking advantage in both cases of the ignorance of the vender or buyer, is no better than a thief, as he actually robs his neighbor of as much property as he has bought the article at below or sold it above its current value.
Verse 15

According to the number of years - The purchases that were to be made of lands were to be regulated by the number of years unelapsed of the current jubilee. This was something like buying the unexpired term of a lease among us; the purchase is always regulated by the number of years between the time of purchase and the expiration of the term.
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