Rashi on Leviticus 20:2/רש"י על ויקרא כ׳:ב׳

1ואל בני ישראל תאמר AGAIN THOU SHALT SAY TO THE CHILDREN OF ISRAEL the punishments for the transgression of the prohibitions mentioned in the previous chapters.

2מות יומת HE SHALL SURELY BE PUT TO DEATH by sentence of the court; and if the court has not sufficient authority to carry this out, then, ‎ 'וכו‎‎ עם הארץ the people of the land shall assist them (Sifra, Kedoshim, Section 4 4).

3עם הארץ THE PEOPLE OF THE EARTH — that people for whose sake the earth was created: Israel (cf. Rashi on Genesis 1:1); or, that people which is destined to remain in possession of the Land (Canaan) through obedience to these commands (Sifra, Kedoshim, Section 4 4).