Reference for Bava Batra 339:15

איפוך

[indeed] yours but I have paid you'. the [validity of the] deed is established by those who signed it.<span class="x" onmousemove="('comment',' Since the original validity of the deed is thus established, the creditor is entitled to judgment in his favour. ');">²⁸</span> So<span class="x" onmousemove="('comment',' Lit., 'the words of'. ');">²⁹</span>

Jastrow

Jastrow