Reference for Bava Metzia 8:6

אי נמי משום דהוה ליה שטר שעבוד קרקעות ואין נשבעין על כפירת שעבוד קרקעות

But if this is so, [and 'two' also involves an oath,] should not R. Simeon b. Eleazar, who says, 'Seeing that he has admitted part of the claim he must take an oath,' have said instead: He also must swear?<span class="x" onmousemove="('comment',' If 'two' involves an oath, then it was wrong to give 'partial admission' as a reason for the oath, since in such a case there would be no admission apart from what is proved by the written document. On the other hand, it should have been emphasised that 'three' also involved an oath, in spite of the fact that the admission of the third sela' is like the restoration of a lost object to its owner. ');">⁶</span>

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