Reference for Bava Metzia 200:10

אלא ממאי דסבר ר"מ מקשינן קרקע לעבד מה עבד נשבעין אף קרקע נשבעין דלמא אעבד הוא דנשבעין אבל אקרקע לא

— You cannot think so. For it has been taught: If a cow is exchanged for an ass, and it calved; likewise, if one sells his maidservant, and she bore a child, one says, 'It happened in my possession,' and the other is silent, the former acquires it. If each says, 'I do not know,' they divide; if each pleads, 'It happened in my ownership,' the vendor must swear that she bore whilst in his possession, because all who take an oath in accordance with Scriptural law, swear to be freed from liability:<span class="x" onmousemove="('comment',' I.e., the plaintiff is not permitted to swear to sustain his claim, but only the defendant, in order to refute it. ');">¹⁰</span>

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