And the earth opened her mouth, and swallowed them up, and their houses, and all the men that appertained unto Korah, and all their goods.

Wesley's Notes

16:32 All that appertained unto Korah - That is, all his family which were there, women, children, and servants; but his sons, who were spared, Num 26:11,58 1Ch 6:22,37, were absent either upon some service of the tabernacle, or upon some other occasion, God so ordering it by his providence either because they disliked their fathers act, or upon Moses's intercession for them. This expression may intimate, that Korah himself was not here, but that he continued with his two hundred and fifty men before the Lord, where they were waiting for God's decision of the controversy. Nor is it probable that their chief captain would desert them, and leave them standing there without an head, especially, when Aaron his great adversary, abode there still, and did not go with Moses to Dathan. And Korah may seem to have been consumed with those two hundred and fifty. And so much is intimated, Nu 16:40, that no stranger come near to offer incense before the Lord, that he be not as Korah, and as his company, that is, destroyed, as they were, by fire from the Lord. And when the Psalmist relates this history, Psa 106:17 - 18, the earth's swallowing them up is confined to Dathan and Abiram, Psa 106:17, and for all the rest of that conspiracy it is added, Psa 106:18. And a fire was kindled in their company, the flame burnt up the wicked.

Matthew Henry's Concise Commentary

16:23-34 The seventy elders of Israel attend Moses. It is our duty to do what we can to countenance and support lawful authority when it is opposed. And those who would not perish with sinners, must come out from among them, and be separate. It was in answer to the prayer of Moses, that God stirred up the hearts of the congregation to remove for their own safety. Grace to separate from evil-doers is one of the things that accompany salvation. God, in justice, left the rebels to the obstinacy and hardness of their own hearts. Moses, by Divine direction, when all Israel were waiting the event, declares that if the rebels die a common death, he will be content to be called and counted an imposter. As soon as Moses had spoken the word, God caused the earth to open and swallow them all up. The children perished with their parents; in which, though we cannot tell how bad they might be to deserve it, or how good God might be otherwise to them; yet of this we are sure, that Infinite Justice did them no wrong. It was altogether miraculous. God has, when he pleases, strange punishments for the workers of iniquity. It was very significant. Considering how the earth is still in like manner loaded with the weight of man's sins, we have reason to wonder that it does not now sink under its load. The ruin of others should be our warning. Could we, by faith, hear the outcries of those that are gone down to the bottomless pit, we should give more diligence than we do to escape for our lives, lest we also come into their condemnation.