Reference for Yoma 76:9
אמר ר' אלעזר צדיק דר בין שני רשעים ולא למד ממעשיהם רשע דר בין שני צדיקים ולא למד ממעשיהם צדיק דר בין שני רשעים ולא למד ממעשיהם עובדיה רשע דר בין שני צדיקים ולא למד ממעשיהם זה עשו
and it is written: Now the men of Sodom were wicked and sinners against the Lord exceedingly.<span class="x" onmousemove="('comment',' Ibid. 13.');"><sup>13</sup></span> R'Eleazar said: A righteous man once lived between two wicked men and did not learn from their deeds, a wicked man lived between two righteous men and did not learn from their ways - The righteous who lived between two wicked men and did not learn from their wicked ways was Obadiah.<span class="x" onmousemove="('comment',' Who lived between Ahab and Jezebel. V. Sanh. 12b.');"><sup>14</sup></span> The wicked man living between two righteous men and not learning from their ways was Esau.