A few NT examples, where sickness is a judgement of God, not the devil. Sure devil can make people sick too.
Worship and the Lord’s Supper - Imitate me, just as I also imitate Christ. Head Coverings - Now I praise you, brethren, that you remember me in all things and keep the traditions just as I delivered them to you. But I want you to know that the head of every man is Christ, the head of woman is...
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23 For I received from the Lord that which I also delivered to you: that the Lord Jesus on the
same night in which He was betrayed took bread; 24 and when He had given thanks, He broke
it and said, [
d]“Take, eat; this is My body which is [
e]broken for you; do this in remembrance of Me.” 25 In the same manner
He also
took the cup after supper, saying, “This cup is the new covenant in My blood. This do, as often as you drink
it, in remembrance of Me.”
26 For as often as you eat this bread and drink this cup, you proclaim the Lord’s death till He comes.
Examine Yourself
27 Therefore whoever eats this bread or drinks
this cup of the Lord in an unworthy manner will be guilty of the body and [
f]blood of the Lord. 28 But let a man examine himself, and so let him eat of the bread and drink of the cup. 29 For he who eats and drinks [
g]in an unworthy manner eats and drinks judgment to himself, not discerning the [
h]Lord’s body. 30
For this reason many are weak and sick among you, and many [
i]sleep. 31 For if we would judge ourselves, we would not be judged. 32
But when we are judged, we are chastened by the Lord, that we may not be condemned with the world.
33 Therefore, my brethren, when you come together to eat, wait for one another. 34 But if anyone is hungry, let him eat at home, lest you come together for judgment. And the rest I will set in order when I come.
And I gave her time to repent of her sexual immorality, and she did not repent. Indeed I will cast her into a sickbed, and those who commit adultery with her into great tribulation, unless they repent of their deeds. I will kill her children with death, and all the churches shall know that I am...
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The Corrupt Church
18 “And to the [
h]angel of the church in Thyatira write,
‘These things says the Son of God, who has eyes like a flame of fire, and His feet like fine brass: 19 “I know your works, love, [
i]service, faith, and your [
j]patience; and
as for your works, the last
are more than the first. 20
Nevertheless I have [k]a few things against you, because you allow [l]that woman Jezebel, who calls herself a prophetess, [m]to teach and seduce My servants to commit sexual immorality and eat things sacrificed to idols.
21 And I gave her time to [
a]repent of her sexual immorality, and she did not repent. 22
Indeed I will cast her into a sickbed, and those who commit adultery with her into great tribulation, unless they repent of [
b]their deeds. 23
I will kill her children with death, and all the churches shall know that
I am He who searches[c] the minds and hearts. And I will give to each one of you according to your works.