Matthew 16:6,11,12
Then Jesus said to them, Take heed and beware of the leaven of the Pharisees and of the Sadducees.
Torrey's Topical Textbook—AKJV

Luke 12:1
In the mean time, when there were gathered together an innumerable multitude of people, so that they stepped one on another, he began to say to his disciples first of all, Beware you of the leaven of the Pharisees, which is hypocrisy.
Torrey's Topical Textbook—AKJV