Parashas Acharei Mos · Passuk 17:04
Chabad.org — English translation + Rashi
Torah Temima points to Toras Kohanim.
English: “From among his people” — from among his people, and his people are at peace (i.e., the penalty assumes a normal communal setting).
Contextual reading of “from his people”
The karet formulation presupposes that the offender is cut off from a peaceful, intact people.