Deuteronomy 29:19-22:
And it come to pass, when he heareth the words of this curse, that he bless himself in his heart, saying, I shall have peace, though I walk in the imagination of mine heart, to add drunkenness to thirst:
The LORD will not spare him, but then the anger of the LORD and his jealousy shall smoke against that man, and all the curses that are written in this book shall lie upon him, and the LORD shall blot out his name from under heaven.
And the LORD shall separate him unto evil out of all the tribes of Israel, according to all the curses of the covenant that are written in the book of the law:
So that the generation to come of your children that shall rise up after you, and the stranger that shall come from a far land, shall say, when they see the plagues of that land, and the sicknesses which the LORD hath laid upon it;
Notes on Deuteronomy 29:19-22:
This is another passage that clearly declares plagues and sickness to be a curse! You cannot avoid the conclusion that God declares sickness to be a curse. Agree with God and call it a curse yourself. Then get bold and determine that you will tolerate anything that is a curse in your body!
This is another proof that the LORD could put sickness on those who broke the Law of Moses; it does not say that He would “allow” Satan to lay the sicknesses on people.
See also: