Treasury of Scripture Knowledge
Then they understood that he did not tell them to beware of the leaven of bread, but of the teaching of the Pharisees and Sadducees.
And he cautioned them, saying, "Take heed, beware of the leaven of the Pharisees and the leaven of Herod."
In the meantime, when so many thousands of the multitude had gathered together that they trampled one another, he began to say to his disciples first of all, "Beware of the leaven of the Pharisees, which is hypocrisy.
1 Corinthians 5:6
Your boasting is not good. Do you not know that a little leaven leavens the whole lump of dough?
A little leaven leavens the whole lump of dough.
2 Timothy 2:16
Avoid godless chatter, for it will lead people into more and more ungodliness,
So the disciples said to one another, "Has any one brought him food?"