For the source text click/tap here: Bava Metzia 57
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The Sages conclude from the pasuk in Vayikra (25:14) – which is the source for the prohibition of ona’a – that ona’a applies only when something is sold or bought me-yad amitekhah – from your fellow’s hand.
Thus we conclude that ona’a does not apply in a number of cases, including the purchase of slaves, contracts, real estate, and things consecrated to the Temple.
Our daf further discussed these exceptions to ona’ah...
The mishna teaches: An unpaid bailee does not take an oath if these items were stolen or lost. The Gemara asks: From where are these matters derived? It is as the Sages taught in a baraita with regard to the verse that discusses an unpaid bailee:
“When a man delivers to his neighbor money or vessels to safeguard, and it is stolen out of the man’s house; if the thief is found, he shall pay double. If the thief is not found, then the master of the house shall approach the judge” (Exodus 22:6–7).
“When a man delivers to his neighbor” is a generalization; “money or vessels” is a detail. And when the verse states: “And it is stolen out of the man’s house,” it then generalizes again.
We explore this hermenutical principle of klal Pratt klal….כְּלָל וּפְרָט וּכְלָל