Kabbalah zu Bereschit 41:1

"And it came to pass at the end of two years" (Beresheet 41:1). Rabbi Chiya opened the discussion with the verse, "He puts an end to darkness, and searches out all perfection, the stone of darkness and the shadow of death" (Iyov 28:3). "He puts an end to darkness" is the end of the left. He hovers about the world; he hovers above and stands before the Holy One, blessed be He, and blames and accuses the world. As it is written, he "searches out all perfection (Heb. תַּכְלִית)," for his deeds are not intended to achieve good, but rather to exterminate (Heb. lechalot) and bring extinction to the world.