Rashi on Numbers 16:11/רש"י על במדבר ט״ז:י״א

1לכן means because of this — because of all this that I have mentioned, אתה וכל עדתך הנועדים BOTH YOU AND ALL YOUR CONGREGATION WHO ARE GATHERED with you, על ה׳ are AGAINST THE LORD, for it is by His commission that I am acting in giving the Priesthood to Aaron; and this rebellion is therefore not against “us” (Midrash Tanchuma, Korach 6).