Reference for Bekhorot 110:23

<big><strong>גמ׳</strong></big> מנא הני מילי

And there is a discrepancy between two opinions held by him.<span class="x" onmousemove="('comment',' By Samuel, who says above that a river grows waters coming down the shores, which contradicts the opinion expressed by him in the following observation. Var. lec.: There is a discrepancy between one opinion of Samuel and another.');">¹³</span>

Jastrow