Numbers 16:29-30

16:29 If these men die a natural death, or if they share the fate of all men, then the Lord has not sent me. 16:30 But if the Lord does something entirely new, and the earth opens its mouth and swallows them up along with all that they have, and they go down alive to the grave, then you will know that these men have despised the Lord!”

Deuteronomy 28:59

28:59 then the Lord will increase your punishments and those of your descendants – great and long-lasting afflictions and severe, enduring illnesses.