Deuteronomy 28:59-63

then the Lord will bring extraordinary plagues on you and your descendants, severe and lasting plagues, and miserable and chronic sicknesses.

And He will bring back on you every disease of Egypt of which you were afraid, and they will cling to you.

Also every sickness and every plague, which are not written in the book of this Law, the Lord will bring on you until you are destroyed.

Then you will be left few in number, whereas you were as numerous as the stars of heaven, because you did not obey the Lord your God.

And it will come about that, just as the Lord rejoiced over you to be good to you, and make you numerous, so will the Lord rejoice over you to wipe you out and destroy you; and you will be torn away from the land which you are entering to possess.