Acts 13:6-12:

And when they had gone through the isle unto Paphos, they found a certain sorcerer, a false prophet, a Jew, whose name was Bar-Jesus:
Which was with the deputy of the country, Sergius Paulus, a prudent man; who called for Barnabas and Saul, and desired to hear the word of God.
But Elymas the sorcerer (for so is his name by interpretation) withstood them, seeking to turn away the deputy from the faith.
Then Saul (who is called Paul,) filled with the Holy Ghost, set his eyes on him,
And said, O full of all subtilty and mischief, thou child of the devil, thou enemy of all righteousness, wilt thou not cease to pervert the right ways of the Lord?
And now, behold, the hand of the Lord is upon thee, and thou shalt be blind, not seeing the sun for a season. And immediately there fell on him a mist and a darkness; and he went about seeking some to lead him by the hand.
Then the deputy, when he saw what was done, believed, being astonished at the doctrine of the Lord.

Notes on Acts 13:6-12:

Some people are convinced that God would NEVER make anyone sick, but the Bible clearly teaches otherwise.  It was the hand of the Lord, not the hand of Satan, that sickened the sorcerer.  Trying to stop someone from sharing the words of eternal life with someone else is a very serious offense in God’s eyes because God wants everyone to be saved.  I once had a fake minister try to interfere with my public preaching during which I led 3 members of his fake church to Christ.  Very shortly thereafter, that man was reassigned to the remotest county in the state and that was the end of that problem.

You don’t have to worry about this kind of judgment on yourself unless YOU are trying to interfere with the proclamation of the good news!

See also:

Notes on Acts 11:19-21
Sickness as Chastening and Judgment in the New Testament
Signs and Wonders!
Healing by Spoken Words
Baptism with the Spirit and Being Filled with the Spirit
What Are the Differences Between the Gift of Faith, the Gifts of Healings, and the Working of Miracles?
Objection: God Wouldn’t Heal Paul’s Thorn in the Flesh
Objection: God Creates Dumb, Deaf and Blind People (Exodus 4:11)
Condition: Blindness