Then, in what way did the angel fall? Jude 1:6-7 reads: "And the angels that did not keep their own position but left their proper dwelling have been kept by him in eternal chains in the nether gloom until the judgment of the great day; just as Sodom and Gomorrah and the surrounding cities, which likewise acted immorally and indulged in unnatural lust, serve as an example by undergoing a punishment of eternal fire." From this we can see clearly that the sin of the angel was an immoral act of unnatural lust. This immoral act cannot be committed alone; rather, there must be a partner. But who could it have been? In the Garden of Eden, there was only man who could commit sin with an angel. Then what is the sin of the first human ancestors?