Reference for Bava Batra 213:6
אמר רב פפא הלכתא בכל הני שמעתתא מקמצין אמימר אמר בטלה מחלוקת והלכתא בטלה מחלוקת:
Samuel said that he [whose share was seized] forfeited his claim, because he holds the opinion that brothers, after having divided [their father's estate between them], stand to each other in the relationship of vendees, each being in the position of a purchaser without a warranty [of indemnity].<span class="x" onmousemove="('comment',' None of them having undertaken to make good the loss of any of the others. ');"><sup>11</sup></span> R. Assi is in doubt whether they still remain co-heirs or stand in the relationship of vendees; he [whose share was seized] takes, therefore, a quarter<span class="x" onmousemove="('comment',' Of his brother's share. Half the share certainly belongs to his brother, and the doubt is only in respect of the other half; hence it is divided between the two, each one receiving, or retaining a quarter of it. ');"><sup>12</sup></span>