Reference for Bava Batra 92:9

תנו רבנן ערב מעיד ללוה והוא דאית ליה ארעא אחריתי מלוה מעיד ללוה והוא דאית ליה ארעא אחריתי

A lender may testify on behalf of a borrower,<span class="x" onmousemove="('comment',' In regard to land claimed from him by a third party. ');">¹⁴</span> provided that the borrower has other land [besides that which is being claimed from him].<span class="x" onmousemove="('comment',' The same reason applies as to the surety. ');">¹⁶</span>

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