וַיְדַבֵּ֣ר מֹשֶׁ֔ה אֶֽל־אַהֲרֹ֖ן וְאֶל־בָּנָ֑יו וְאֶֽל־כָּל־בְּנֵ֖י יִשְׂרָאֵֽל׃ (פ)
И сказал Моисей Аарону и сынам его и всем сынам Израилевым.
Siftei Chakhamim
To warn the court. Because if not so, what have Yisroel to do with the warning of the kohanim?
Rav Hirsch
V. 24. Diese Freihaltung des jüdischen Gottesheiligtums von der Idee eines moralischen Siechhauses für verstümmeltes, gebrochenes Leben wird hiermit zum Anliegen der nationalen Gesamtheit gemacht.
Rashi
אל אהרן ואל בניו ואל כל בני ישראל UNTO AARON AND UNTO HIS SONS AND UNTO ALL THE CHILDREN OF ISRAEL — He told it to the Israelites although they were not directly concerned with these commands in order to admonish the court regarding the priests (i. e. that the authorities should watch over the sanctity of the Sanctuary and prevent priests with a bodily blemish from officiating) (Sifra, Emor, Chapter 3 12).