Reference for Bava Metzia 4:6

אפילו תימא בן ננס התם ודאי איכא שבועת שוא הכא איכא למימר דליכא שבועת שוא אימור דתרוייהו בהדי הדדי אגבהוה

express surprise at the decision of the Sages to impose oaths on disputants one of whom is bound to swear falsely? — The Mishnah may well be in agreement with Ben Nannus. For in the case [where Ben Nannus objects to the oath] it is certain that if both parties take the oath one of them will commit perjury. But in our Mishnah it may well be assumed that no perjury will be committed [even if both parties swear], for it is possible that both of them picked up the garment simultaneously.<span class="x" onmousemove="('comment',' In this case each finder would be entitled to swear that half of the garment belongs to him, in the belief that he was first in picking up the whole of it. The same applies to a bought article if the seller consented to sell it to both at the same time. ');">⁵</span>

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