Targum zu Bereschit 15:11

And there came down idolatrous peoples which are like to unclean birds, to steal away the sacrifices of Israel; but the righteousness of Abram was a shield over them.

And when the birds descended, they came not nigh the divisions: those birds are unclean fowl, and those unclean fowl are the kingdoms of the earth which are worshippers of idols, and which counsel evil counsels against the sons of Israel; but the integrity of the righteous Abram hindered them.