Heresy-St. Ignatius of Antioch

I exhort you, then, to leave alone the foreign fodder of heresy and keep entirely to Christian food. . . .For heretics mingle poison with Jesus Christ, as men might administer a deadly drug in sweet wine . . . so that without thought or fear of the fatal sweetness a man drinks his own death.

Letter to the Trallians, 6. (2nd century)