Matthew 16:12
"Then understood they how that he bade them not beware of the leaven of bread, but of the doctrine of the Pharisees and of the Sadducees."
Cross References (ranked by relevance)
Matthew 5:20
For I say unto you, That except your righteousness shall exceed the righteousness of the scribes and Pharisees, ye shall in no case enter into the kingdom of heaven.
Acts 23:8
For the Sadducees say that there is no resurrection, neither angel, nor spirit: but the Pharisees confess both.