Parashas Kedoshim · Passuk 19:02
Chabad.org — English translation + Rashi
Torah Temimah points to Toras Kohanim.
English: “Speak to the entire congregation” — this teaches that the passage was stated in assembly. Why in assembly? Because most of the fundamental teachings of the Torah depend upon it.
Hakhel — public proclamation of core mitzvos
Parashas Kedoshim was delivered to the whole nation at once, not only to the leaders, because the majority of its laws belong to the daily life of every Jew.