ויקומו לפני משה ואנשים מבני ישראל חמשים ומאתים, all these who ganged up on Moses and Aaron were from Korach’s own tribe, i.e. Levites. This is the meaning of Moses saying to them: “רב לכם בני לוי, “enough for you Levites, etc.” (verse 7), as well as when he again addressed them as בני לוי in verse 8, i.e. stressing that the people he was speaking to were all Levites. Perhaps these Levites had been under the impression that their whole tribe had been meant to be priests and that Moses had highhandedly decided to bestow this honour only on his brother Aaron.

הבדלו מתוך העדה הזאת; G’d referred to the congregation of Korach, not to the community of the people of Israel.

'ויאמרו, א-ל אלוקי הרוחות לכל בשר וגו, G’d immediately informed Moses that He did not intend to wipe out the nation but only the congregation of Korach. This is why I explained that the words הבדלו, etc. referred only to that Moses and Aaron should put distance between themselves and the congregation of Korach as well as between themselves and Datan and Aviram (compare verse 24). He repeated this instruction in verse 24, hoping that possibly, when the people observed how Moses and Aaron put space between themselves and the insurgents they would follow suit and do the same.