Reference for Bava Batra 190:1

וזהו אוצר ששנו חכמים במשנתינו

and this is the cellar [about] which the Sages have taught in our Mishnah!<span class="x" onmousemove="('comment',' How, then, has it been said before that our Mishnah deals with the case where the seller said. 'I sell you a cellar of wine'? ');">¹</span> — Well, then, our Mishnah also [speaks of the case] where [the seller] said to him 'This'.<span class="x" onmousemove="('comment',' I.e., 'I sell you this cellar'. ');">²</span>

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