For the source text click/tap here: Bava Metzia 56
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The first rule of the Mishna is that the rules of ona’ah (exploitation) – rules that forbid overcharging or undercharging at the time of sale – do not apply in any of the four cases.
The Gemara explains that this is learned from the passage that is the source of the prohibition of ona’ah (Vayikra 25:14), where the Torah teaches that ona’ah is forbidden when something is sold or bought me-yad amitekhah – from your fellow’s hand.
This is understood to exclude real estate which does not transfer from hand to hand.
The other cases are derived by the Gemara from the law about real estate.
We continue our exploration of canonized texts, early rabbinic authority and transmission.