Numbers 26:10 (BSB)

And the earth opened its mouth and swallowed them along with Korah, whose followers died when the fire consumed 250 men. They serve as a warning sign.

From Numbers 26. Also in the ESV.

Commentary on Numbers 26:10

• Matthew Henry (Presbyterian), Matthew Henry's Complete Commentary on Numbers 26:5-51: This is the register of the tribes as they were now enrolled, in the same order that they were numbered in ch. 1. Observe, I. The account that is here kept of the families of each tribe, which must not be understood of such as we call families, those that live in a house together, but such as were the descendants of the several sons...
• John Gill (Reformed Baptist), Exposition of the Old and New Testaments on Numbers 26:10: Notwithstanding, the children of Korah died not. Neither of the pestilence, nor by fire, nor by the swallowing up of the earth; they not being in the counsel of their father, but followed the doctrine of Moses the prophet, as the Targum of Jonathan; they either disliked their father's scheme, or, if they engaged with him in it, they repented and departed from him, and...
• Jamieson-Fausset-Brown (Reformed), Commentary Critical and Explanatory on the Whole Bible on Numbers 26:10: the earth opened her mouth, and swallowed them up together with Korah--rather, "the things of Korah." (See on Num 16:35; compare Psa 106:17).
• Geneva Bible Notes (Reformed), Geneva Bible Study Notes on Numbers 26:10: And the earth opened her mouth, and swallowed them up together with Korah, when that company died, what time the fire devoured two hundred and fifty men: and they became a sign. (d) That is, as an example that others should not complain and rebel against God's ministers.