Genesis Rabbah 39:6

Rabbi Azariah in the name of Rabbi Acha opened with (Psalms 45:8) "You love righteousness and hate wickedness, therefore God your God has anointed you with oil of gladness above all your peers". Rabbi Azariah applied the verse to Abraham in the moment that Abraham our father requested mercy upon the people of Sodom.....Rabbi Levi said "the Judge of the whole world will not to justice, [is like saying] If You want the world there cannot be strict justice, and if it's strict justice that You want there can't be the world, but You grab the rope by both ends, wanting the world and wanting strict justice. Let go of one of them because if you do not give a little the world will not be able to survive". The Holy One, Blessed Be He, said to Avraham "'You love righteousness and hate wickedness, therefore God your God has anointed you with oil of gladness above all your peers', you have loved to defend my creatures and you have hated to find them guilty therefore God has anointed you... above all your peers". All your fellows from Noah until yourself, 10 generations, and I did not speak to any of them except for you: "Now the Eternal said to Avram...".