Kabbalah sobre Números 23:21

Bilaam said to Balak: Come and behold. Who can prevail over them, seeing that all the divination and witchcraft in our crowns are adorned by the illumination of the upper Malchut, and he, Zeir Anpin, is bound to them, Yisrael, as it is written, "Hashem his Elohim is with him, and the trumpet blast of a king is among them" (Num. 23:21). Therefore, we can not use our witchcraft to harm them.