Rabbi Yehuda ben Maharam Chalava comments on Yaakov Avinu’s three preparations for meeting Esav: “What happened to Yaakov with Esav will happen to us in all generations, and we must prepare ourselves with prayer and gifts, but not with war. Scripture has prohibited this under oath, as it says, ‘I adjure you, daughters of Jerusalem, by the gazelles and deer of the field.’” (Imrei Shefer on Vayishlach)