Reference for Bava Batra 308:13
והא רבי יוחנן ראיה בעדים קאמר איפוך לימא ליפוך נמי תיובתא לא
— Reverse [the order]. But, surely, R. Johanan said: Proof [must be produced] by witnesses?<span class="x" onmousemove="('comment',' Supra 154a. How, then, could he say here, 'proof (can be produced) only through attestation of the deed'? ');"><sup>45</sup></span> — Reverse [the order].<span class="x" onmousemove="('comment',' The view attributed, supra, to R. Johanan is really that of R. Lakish, and vice versa, ');"><sup>46</sup></span> Is it [then] to be assumed [that] the objection also is to be reversed?<span class="x" onmousemove="('comment',' Is the objection which R. Johanan raised against R. Lakish (supra 154a) to be reversed and read as if R. Lakish had raised it against R. Johanan? ');"><sup>47</sup></span> — No;