Reference for Bava Metzia 216:1

ואי לא איערומי קא מערים

otherwise it is mere evasion.<span class="x" onmousemove="('comment',' If A buys a small piece of land in the middle of B's estate, he immediately becomes a neighbour to the surrounding estate, just as C, the original neighbour on the outer side. Now, if the land bought by A is distinctly inferior or superior to the rest, it is natural that it should be sold separately, and the sale is genuine. But if it is just the same, it is obviously a mere fiction to make A the neighbour of B, and therefore C retains his rights of pre-emption. ');">¹</span>

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