2 Kings 5:27:

The leprosy therefore of Naaman shall cleave unto thee, and unto thy seed for ever.

Notes on 2 Kings 5:27:

This verse has Elisha’s words to his deceitful servant Gehazi.  Elisha wanted Naaman to be healed for free, but Gehazi went after Naaman and said that Elisha wanted some provisions for two guests.  Naaman was happy to oblige.  Elisha knew about this incident supernaturally and pronounced this judgment upon Gehazi.  This is yet another example of sickness being a curse and a judgment.

See also:

Sickness as Chastening and Judgment in the Old Testament

Condition: Leprosy