Kabbalah zu Schemuel I 28:16

He asks, what is a watcher (ir) and answers, he explained in the book of Aggadah that it is similar to “and become your enemy (ar)” (I Shmuel 28:16). For the judgments rise against those who are not beloved above; those who arise to execute judgment are their enemies. They are therefore called watchers. Nevertheless, the decree is formed in two ways – with mercy and with judgment; hence, they are called watchers and holy ones – judgment and mercy, referring to the verse, “This matter is by the decree of the watchers, and the sentence by the word of the holy ones.” Watcher indicates judgment and holy one mercy.