Kabbalah sur Isaïe 26:14

The Refaim (shades) are the fourth group (of the erev rav). If they notice a time of distress coming upon Yisrael, they abandon them. Even if they have the power to save them, they do not want to do so. They abandon the Torah and those who study it. Instead, they do favors to those who worship idols. Of them, it is written: "The shades of the dead (Heb. refaim) shall not rise" (Isaiah 26:14), (i.e. at the resurrection of the dead). When The Children of Yisrael are visited (to be redeemed), it is written about them: "And made all their memory to perish" (Ibid.).