Sorry for not putting this little tidbit in the original post on Leviathan. I knew that there was a mention of Leviathan and Behemoth in the Book of Enoch ... but it took me another day or two to find it. As I have explained in my book, The Mythology of Supernatural, the Enoch text predates all Judeo-Christian writings and was heavily influential in the development of Judaism.
So, without further ado:
“And on that day two monsters shall be parted – one monster, a female named Leviathan in order to dwell in the abyss of the ocean over the fountains of water; and [the second], a male called Behemoth which holds his chest in an invisible desert whose name is Dundayin, east of the garden of Eden." -1 Enoch 60:7-8
You may remember that, in my original blog post about Leviathan, I mentioned how Leviathan and Behemoth were once considered two creatures which joined to create a terrifying monster. Later on the myth was changed when Lilith entered the tradition, and explained how Lilith was mated to Samael after her expulsion from Eden ... and that the joining of these two came to be known as Leviathan (however, I am not sure that the writers of Supernatural are going to follow this part). Notice also that Enoch refers to Leviathan as "female" ... this certainly differs from the traditinal Judaic demonology/lore. However, this may just be an earlier version of the idea that these titanic monsters of old, made by YHVH/God before Humans, some say on the 5th day of Creation, encompassing both destruction & creation (since without destruction there is no creation), existed as a joining of male & female entities. This is in line with early Judaic concepts of the divine male and female, such as Shekinah (which is, more or less, the feminine nature of God ... believed to have been viewed as God's "Wife" at one point in early Semitic traditions).
As for Behemoth, there is lore which claims this titanic monster became drawn to the land, joining his physical form to an "invisible desert" called Dudayin, a place "east of Eden" where no human may dwell.
Well ... that is all for now. If anyone has questions, feel free to post them in the comments.
FYI - Sometime tomorrow, I will be posting links/details on an auction that will be held for a signed copy of The Mythology of Supernatural and a personally handmade Mojo Bag (they will be auctioned together as a set).