Gehazi was the servant of Prophet Elisha. He was privileged to be the apprentice of a great prophet and had the potential of inheriting at least the double portion of Elijah’s power that was upon Elisha. However, his covetousness ruined his destiny as a would-be great prophet. He decided to go after the material things of this world at the expense of his prophetic calling. He was so determined to go after worldly things that he even swore by God that he must “possess his possessions”. Like present-day worldly preachers, he seemed to be saying: “...after all, he that labours by the altar must feed by the altar”. Consider his words in 2 Kings 5:20:
“But Gehazi, the servant of Elisha the man of God, said, Behold, my master hath spared Naaman this Syrian, in not receiving at his hands that which he brought: but, as the Lord liveth, I will run after him, and take somewhat of him.”
Once his sin of covetousness was found out by his master, the leprosy of Naaman was transferred to him and all his generations after him (2 Kings 5:27).
 
Judas Iscariot is another individual we should learn from. He had almost the same moral and spiritual problem as Gehazi: covetousness and greed. The Bible says he was a thief, and being the treasurer of Jesus’ ministry, he often stole from the purse (John 12:4-6). His greed got to the level where he took a decision that condemned him to eternal perdition: he decided to sell his Master, the King of glory (Matthew 26:14-16). Before Judas Iscariot realised his folly, he had already ruined the opportunity of having himself numbered among the twelve apostles. He ended up committing suicide.
“Then Judas, which had betrayed him, when he saw that he was condemned, repented himself, and brought again the thirty pieces of silver to the chief priests and elders,...And he cast down the pieces of silver in the temple, and departed, and went and hanged himself.”
Matthew 27:3&5
 
Children of God in the 21st century must be wary of materialism. It is deadly, though it may not look that way. This is why John the Beloved warned us against worldliness, as if he knew what would become of the Church in the end-times (1 John 2:15-17).