Reference for Bava Metzia 28:7

ממשעבדי הוא דלא מפקינן הא מבני חורין מפקינן וקתני מיהא לשבח קרקעות מאי לאו בלוקח מגזלן

It was stated: If one sells a field to his neighbour and it turns out not to be his own,<span class="x" onmousemove="('comment',' The seller had acquired the field wrongfully and had no title to the property. The rightful owner then comes and seizes the field from the buyer. ');">⁷</span>

Jastrow

Jastrow