Reference for Bava Batra 127:8

וצריך ליקח לו דרך דברי ר"ע וחכמים אומרים אינו צריך וכו': מאי לאו בהא קא מפלגי

R. Ashi [also] as he sat [and studied this section] asked: Is not WELL identical with CISTERN? Said Mar Kashisha the son of R. Hisda to R. Ashi: Come and hear: It was been taught: Both 'well' and 'cistern' are excavations in the soil, only a 'well' is merely dug out, whereas a 'cistern' is faced with stone. HE MUST BUY HIMSELF THE RIGHT OF WAY. THIS IS THE RULING OF R. AKIBA. THE SAGES, HOWEVER, SAY THAT HE NEED NOT. [We may assume,] may we not, that the point at issue between them is this,

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