Deuteronomy 28:58-63

Be careful to obey everything in these teachings that are written in this book. You must respect the glorious and wonderful name of the LORD your God, or the LORD will give terrible diseases to you and your descendants. You will have long and serious diseases, and long and miserable sicknesses. He will give you all the diseases of Egypt that you dread, and the diseases will stay with you. The LORD will also give you every disease and sickness not written in this Book of the Teachings, until you are destroyed. You people may have outnumbered the stars, but only a few of you will be left, because you did not obey the LORD your God. Just as the LORD was once happy with you and gave you good things and made you grow in number, so then the LORD will be happy to ruin and destroy you, and you will be removed from the land you are entering to take as your own.