The Talmud relates a debate between Moshe and the Angels concerning the giving of the Torah to the Jews. Moshe observes that many of the mitzvot are inapplicable to angels, among them the prohibition of murder, which, the Talmud implies, is irrelevant in the absence of jealousy. The Meshekh Chokhmah (Devarim 32:3) observes that this point is reflective of a fundamental difference between Angels and people. Angels are completely unaffected by the presence of each other; murder is thus irrelevant. This is in stark contrast to humanity, where social interaction and communal bonds are a vital necessity.