Avot de-Rabbi Nathan [B] 30

...that God will uproot everyone who hates his fellow from the world—as we have found with the people of the Sodom who were only uprooted by God because they hated each other, as it says: “The people of Sodom were wicked and sinned against God, exceedingly (Genesis 13:13). [How were they] wicked? To each other. [How did they] sin? By uncovering nakedness. [They also committed] murder exceedingly. They also [committed] mishkav zachar (lying with a man) exceedingly. [Translation by Rabbi Steven Greenberg]