Now there dwelt an old prophet in Bethel; and his sons came and told him all the works that the man of God had done that day in Bethel: the words which he had spoken unto the king, them they told also to their father. (1 Kings 13:11)
A prophet, but a false prophet, a man who was a tool of Satan, not of God. Having failed to secure his purpose in one way, Satan now worked in another way, determined to thwart the purposes of the Lord by bringing His messenger into disrepute.