קבלה אויף דברים 23:11

It is the way of a serpent to lie in wait on the cross-roads. So Amalek, the evil serpent of Israel, was lying in wait for them on the cross-roads, as it is written: “how he set himself against him in the way” (Ibid.). He was lying in ambush on high in order to defile the Sanctuary, and below in order to defile Israel. This we deduce from the expression, “how he met thee by the way” (Deut. 25, 18), where the term qar’kha is meant to suggest the kindred term in the passage, “If there be among you any man that is not clean by reason of that which chanceth him (miqre) by night” (Ibid. 23, 11).