This verse marks the end of the first Korah segment of the narrative, which turns to the Reubenite rebels in verse 12.
Therefore it is against the LORD that you and all your company have gathered together: The conjunction Therefore introduces this verse as a conclusion to Moses’ speech. He concludes that the actions and words of Korah and his followers are in effect a rebellion against the LORD. The preceding verses reveal how much they disregarded their own privileged position in religious service (see 4.1-20). Better ways to begin this verse are “Truly…” (New Jewish Publication Society’s Tanakh) and “So in doing this…” (Chewa). The Hebrew pronouns for you and your are singular, referring to Korah, but Moses has Korah’s followers in view also with the phrase all your company, which still carries a note of sarcasm and criticism on Moses’ part (see verses 5-6). There is a play on words in the Hebrew sentence here since the noun for company and the verb for gathered together come from the same root (compare 14.35 for the same wordplay). Models that reflect this wordplay are “Therefore it is against the LORD that you and your whole band have banded together” and “Therefore it is against the LORD that you and your whole assembly have assembled together.”
What is Aaron that you murmur against him?: This is another rhetorical question. Revised Standard Version‘s rendering here may give the wrong impression that Moses looks down on Aaron. However, with this question Moses tells Korah and his followers not to grumble against Aaron, because when they do so, they are actually challenging the LORD, who put Aaron in the position of worship leader. Good News Translation restructures the verse to make this critical implication clear. The Hebrew pronoun for you is plural, referring to Korah and his followers. For the Hebrew verb rendered murmur, see the comments on 14.2.
A model for this verse is:
• Truly, you murmur/speak against [or, complain about] Aaron, but in fact it is against the LORD that you and your whole band have banded together.
Quoted with permission from de Regt, Lénart J. and Wendland, Ernst R. A Handbook on Numbers. (UBS Helps for Translators). Miami: UBS, 2016. For this and other handbooks for translators see here .