A few quotes from the Rabbi on 'Israel and the Nations'
in which he teaches that our Teacher Moses sought to grant merit to all people and nations
Moses said before God: Master of the Universe, you have seventy nations, and you command me for Israel alone?" The commentators, of blessed memory, ask: How did it enter our Master Moses' heart to ask the Blessed One to command him concerning the observation of commandments by another nation?!... In my humble opinion, the reason may be, with God's will, that our Teacher Moses, may he rest in peace, sought to grant merit to the nations.
Yismach Moshe, Shemot, weekly portion Tetsaveh, p. 230, Jerusalem 1989