For the source text click/tap here: Bava Metzia 98
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The Mishna discusses cases of a mixed custodianship, with part rental, and part lending. The custodianship is split either in time (some time rental, some time lending), or in items (one item rented, one item lent). The Mishna detailed the rules when a cow of such a custodianship dies, and the owner and custodian dispute whether it fell under the rental or borrowing section. The Gemora quotes a statement of Rava to explain this case. Rava says that if one claims that someone owes him 100 zuz, and the defendant responds that he is certain that he owes 50, but doesn’t know about the other 50, he must pay the full 100.
In light of recent events I was watching Sir Simon Schama’s historical view (BadChaps, Jews and the Failure of British Decency: Antisemitism in Historical Perspective) and came across the life of Dr Roderigo Lopez the physician to Queen Elizabeth I.