Teil 13 · Kapitel 152

But in Arich Anpin, it is impossible for the shells to take hold there, God forbid. However, from afar it is possible for them to look and gaze, and to feed their eyes from there. Therefore these four locks of hair were placed to cover the white nape, so that they would not feed their eyes from there. And this is the secret in Idra Rabba, page 129, side A: "That they are drawn from behind him down to his shoulders, so as not to show the nape...", and they extend to the head of Zeir Anpin.