Origin and Application:
In his famous sermon on Mount Beatitudes, Jesus cautioned the crowds to beware of false prophets. A true prophet is one who preaches truth according to the Bible and is faithful to Jesus’ teachings. A false prophet may come under the guise of a godly man whose sayings may sway from Christian doctrine.
Some Christians thought that Jesus borrowed this expression from one of Aesop’s fables (620-560 BC), where a wolf wore a sheep’s fleece in hopes of making for food easier. In the end, it was killed by the shepherd who mistook it for hunting a sheep.