Matthew 16:11-12

11 How is it that you fail to perceive that I did not speak about bread? Beware of the leaven of the Pharisees and Sad'ducees."
12 Then they understood that he did not tell them to beware of the leaven of bread, but of the teaching of the Pharisees and Sad'ducees.
Revised Standard Version of the Bible, copyright 1952 [2nd edition, 1971] by the Division of Christian Education of the National Council of the Churches of Christ in the United States of America. Used by permission. All rights reserved.