NUM273 We are obligated to pursue peace. The Midrash says that there are many commandments that the Torah requires us to fulfill when the opportunity presents itself, but does not require us to actively pursue: "If a bird's nest that's interesting chance to be before you…] (Dvorim 22:6); "If you meet the ox of your enemy…" (Shmos 23:4); "If you see the donkey of him that hates you... (ibid. 23;5); "When you beat your olive tree..." (Dvorim 24:20); "When you gather the grapes of your vineyard…" (ibid. 24:21). In each of these instances you are obligated to fulfill the commandment if you find yourself in a particular situation. You are not required, however, to pursue these situations in order to fulfill the relevant commandment. But we are obligated to pursue peace as it is written, "Seek peace and pursue it" (T'hilim 34). Therefore, Israel sent messengers to Sichon to seek peace. (Bamidbar Rabbah 19:16). Hillel said, "Be a disciple of Aharon: Love peace and pursue peace, love people and draw them near to the Torah." (Pirkei Avos 1:12). ... "The Talmud (Yoma 53b) states that after we conclude our silent prayer we should take three steps backwards and then recite the blessing of 'peace.' In other words, for the sake of peace, one must take some paces backwards." Judaism, Thought and Legend, p. 99).