For the source text click/tap here: Bava Metzia 75
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Our Gemara brings a teaching by Rav Yehuda in the name of Rav that if someone lends money without having witnesses to the transaction, he transgresses the prohibition of lifnei iver lo titen mikhshol – do not put a stumbling block before the blind (Lev 19:14). Reish Lakish, quoting a passage in Psalms (66:11) adds that he brings a curse upon himself, since if the borrower denies receiving the loan, people will curse the lender, accusing him of falsely claiming that he is owed money.
We explore the implications of “lifne iver.”