John Gill Bible Commentary

The earth opened and swallowed up Dathan,.... One of the heads of the conspirators against Moses and Aaron; the earth clave asunder under him and his company; opened itself, or its mouth, and devoured them at once. This was a new, marvellous, and unheard of thing, and which manifestly showed the divine displeasure and resentment at their proceedings; and served greatly to confirm the authority and office of Moses and Aaron; see Num 16:30. And covered the company of Abiram; another of the heads of the confederacy. Korah is not mentioned, though the earth swallowed up him and all that belonged to him, their houses and their goods; some think the reason is because it was well known that this was his case, when Dathan and Abiram are not so expressly mentioned in the history by Moses; as also because the sons of Korah were now in esteem as singers; nor is On the son of Peleth mentioned, because, as Kimchi says, he repented, and desisted from the conspiracy.