Kabbalah zu Schemot 2:19

What is written next? "And he slew the Egyptian, a man of good appearance" (II Samuel 23:21). Here the secret of the verse is revealed to let us know that every time Yisrael sinned, he went away and prevented them from receiving all the blessings and all the lights that shone upon them. "He slew the Egyptian." This is the light, the same Light that shone upon Yisrael. And who is he? Moses. As he is described in the verse, "And they said an Egyptian man delivered us" (Ex. 2:19). Because he was born and grew up (in Egypt) until he rose to reach the Supernal Light.

Dam (“Blood”). The closing of the emanation in Binah so that it does not come to Malkhut. Therefore it comes as she has surely drawn (Exod. 2:19), and with her the mem is closed.