For the source text click/tap here: Bava Kamma 27
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Rav Nachman says: A person can take the law into his own hands. If someone is making him lose money which he will not recover if he does not act, everyone agrees he may take the law into his own hands. They argue regarding a case where there is no immediate loss (that cannot be recovered if he waits to go to Beis Din).
Rav Yehudah says: A person cannot take the law into his own hands. Being that there is no immediate loss, let him take the person to Beis Din. Rav Nachman says: A person can take the law into his own hands. Being that he is doing the right thing, he does not have to bother to go to Beis Din.
We explore the notion of taking the law int one’s own hands.