Reference for Bava Batra 143:4
ורבי שמעון אליבא דמאן אי אליבא דר"ע הא אמר מוכר בעין יפה מוכר וכל שכן מקדיש אלא פשיטא אליבא דרבנן וקא סבר ר"ש כי היכי דמוכר בעין רעה מוכר מקדיש נמי בעין רעה מקדיש ומשייר ארעא
Obviously then it must be R. Simeon. Whom then does R. Simeon follow?<span class="x" onmousemove="('comment',' R. Simeon was a disciple of R. Akiba. ');"><sup>10</sup></span> It cannot be R. Akiba, because he says that the vendor sells in a liberal spirit, all the more so then the sanctifier. Obviously then he follows the Rabbis,<span class="x" onmousemove="('comment',' Those who in the discussion with R. Akiba said that the vendor sells in an illiberal spirit. ');"><sup>11</sup></span> and R. Simeon further held<span class="x" onmousemove="('comment',' In opposition to the Rabbis of the Mishnah who intimate that the sanctifier sanctifies in a liberal spirit. ');"><sup>12</sup></span> that just as the vendor sells in an illiberal spirit so the sanctifier sanctifies in an illiberal spirit, and he [therefore] reserves the ground to himself.<span class="x" onmousemove="('comment',' Which shows that R. Simeon could not concur with R. Akiba. ');"><sup>13</sup></span>