(Ibid. 18:5) "For in him (the Cohein) did the L-rd your G-d choose from all of your tribes to stand and minister in the name of the L-rd, he and his sons all of the days."
Similarly (Psalms 135:4) "For Yaakov has the L-rd chosen for Himself, Israel, as His chosen one."
Variantly: "For a holy people are you": (even) more than your forefathers.
"and in you has the L-rd chosen": your own holiness. "to be unto Him a chosen people from all of the peoples": We are hereby taught that each one of the just is beloved by the Holy One Blessed be He as all of the gentiles (together). I might think, even more than the early fathers (Avraham, Yitzchak, and Yaakov). It is, therefore, written "from all the peoples that are on the face of the earth," i.e., from one end of the earth to the other, and not (that they are more beloved) than the first fathers. Variantly: "from all the peoples": and do not cause another people to become holy.