Reference for Bava Batra 92:10

לוקח ראשון מעיד ללוקח שני והוא דאית ליה ארעא אחריתי

A first purchaser may testify on behalf of a second purchaser,<span class="x" onmousemove="('comment',' E.g., if A has sold land to B and then sold other land to C, and C's title is contested by a third party. then B may testify on behalf of C. ');">¹⁷</span> provided that the latter has other land<span class="x" onmousemove="('comment',' I.e., which he has bought from A. ');">¹⁸</span> [besides that which is being claimed from him].<span class="x" onmousemove="('comment',' The rule is that if a creditor has a lien upon land which his debtor has sold, he must seize first the land which the debtor has sold last. Hence in this case, if A's creditor is authorised to seize land which he has sold to others, he cannot seize the land sold to B until he has first seized the land sold to C. Hence if more land has been sold to C than that actually claimed from him, B is not an interested party and may give evidence on his behalf. Similarly B may give evidence on behalf of A himself if he possesses other land besides that which is being claimed from him, and the rule might have been stated in the form 'the purchaser may testify on behalf of the seller', etc. ');">¹⁹</span>

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