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?
Chizkuni
ואל כל בני ישראל, “as well as to all the Children of Israel.” They are warned not to entrust their offerings to priests who are afflicted with blemishes.