Supporting this are the apostle Peter’s references to “the spirits in prison, who had once been disobedient when the patience of God was waiting in Noah’s days” (1Pe 3:19, 20), and to “the angels that sinned,” mentioned in connection with the “ancient world” of Noah’s time (2Pe 2:4, 5), as well as Jude’s statement concerning “the angels that did not keep their original position but forsook their own proper dwelling place.” (Jude 6)
... It should be noted that Jude’s reference to angels as not keeping their original position and to them as forsaking their “proper dwelling place” (certainly here referring to an abandoning of the spirit realm) is immediately followed by the statement: “So too Sodom and Gomorrah and the cities about them, after they in the same manner as the foregoing ones had committed fornication excessively and gone out after flesh for unnatural use, are placed before us as a warning example.” (Jude 6, 7)