Numbers 16:30 (BSB)

But if the LORD brings about something unprecedented, and the earth opens its mouth and swallows them and all that belongs to them so that they go down alive into Sheol, then you will know that these men have treated the LORD with contempt.”

From Numbers 16. Also in the ESV.

Commentary on Numbers 16:30

• Matthew Henry (Presbyterian), Matthew Henry's Complete Commentary on Numbers 16:23-34: We have here the determining of the controversy with Dathan and Abiram, who rebelled against Moses, as in the next paragraph the determining of the controversy with Korah and his company, who would be rivals with Aaron. It should seem that Dathan and Abiram had set up a spacious tabernacle in the midst of the tents of their families, where they kept court, met in...
• John Gill (Reformed Baptist), Exposition of the Old and New Testaments on Numbers 16:30: But if the Lord make a new thing,.... Or "create a creation", or "creature" (s), what never was before, or put those persons to a death that none ever in the world died of yet; what that is he means is next expressed: and the earth open her mouth and swallow them up, with all that appertain unto them; their persons, their wives, children and...
• Geneva Bible Notes (Reformed), Geneva Bible Study Notes on Numbers 16:30: But if the LORD make a new thing, and the earth open her mouth, and swallow them up, with all that [appertain] unto them, and they go down quick into the pit; then ye shall understand that these men have provoked the LORD. (m) Or, show a strange sight. (n) Or, deep and dark places of the earth.
• Keil & Delitzsch (Lutheran), Biblical Commentary on the Old Testament on Numbers 16:27-30: Num 16:27-30 The congregation obeyed; but Dathan and Abiram came and placed themselves in front of the tents, along with their wives and children, to see what Moses would do. Moses then announced the sentence: “By this shall he know that Jehovah hath sent me to do all these works, that not out of my own heart (i.e., that I do not act of my own accord).