Kabbalah su Levitico 26:28

Thus what is written after: “then I will walk contrary (lit. Keri) to you in fury” (Leviticus 26:28). Rabbi Shimon Bar Yochai in the Zohar in Terumah explains about this: 66. This is the secret of that which is written: “And if you walk contrary (Heb. keri) to me” (Vayikra 26:21) and that which is written: “Then I will walk contrary to you also in fury” (Ibid. 28), MEANING with that anger that goes forth from the entrance CALLED ‘keri’. 67. There are those who float around during the night, IF THEY ARE NOT BEING NOURISHED FROM THE SMOKE AS MENTIONED EARLIER. When the souls emerge from the entrance to appear above, they go out and accuse them, so they are not able to ascend and appear above, except for those holy supernal pious ones who split the firmaments and airs and ascend. These camps of spirits go forth and inform people with falsehoods, and appear to them in other FEMALE forms and seduce them until they discharge semen. They are called men who have nocturnal emission of semen (Heb. keri), because it causes those who go forth from the entrance called ‘keri’ TO BE CALLED MEN OF NOCTURNAL EMISSION.