Reference for Bava Batra 154:2

אגב שאני דהא מטבע דלא ניקני בחליפין ואגב ארעא ניקני

And this accords with what we have learned, that movable property<span class="x" onmousemove="('comment',' Lit., 'property which has no secure foundation', from which debtors cannot collect their debts. ');">⁴</span> may be acquired with landed property<span class="x" onmousemove="('comment',' Lit., 'property which has a secure foundation, I.e., real estate which cannot be moved and is consequently always at the disposal of the creditor or anyone having a rightful claim to it. ');">⁵</span> by means of money,<span class="x" onmousemove="('comment',' Paid for the land. ');">⁶</span>

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