Reference for Bava Kamma 92:5
א"ר שמואל בר נחמני מניין להמוציא מחבירו עליו הראיה שנאמר (שמות כד, יד) מי בעל דברים יגש אליהם יגיש ראיה אליהם
for we follow the majority only in ritual matters, but in pecuniary cases we do not follow the majority, but whoever has a [pecuniary] claim against his neighbour the onus probandi falls upon him.
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Jerusalem Talmud Sanhedrin
From where that the burden of proof is on the claimant? Rebbi Crispus in the name of Rebbi Ḥanina ben Gamliel: Shall present before you, shall present his proofs133Babli Bava qamma 46b..
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