'Beware of the Leaven' in the Bible

and therefore when Jesus said to them, Take heed and beware of the leaven of the pharisees and of the sadducees,

How is it then that ye do not understand that I did not speak to you concerning bread, when I bid you to beware of the leaven of the pharisees and of the sadducees?

Then they understood, that He did not bid them beware of the leaven of bread, but of the doctrine of the pharisees and of the sadducees.

And therefore as He was giving them a charge, saying, Take heed, beware of the leaven of the pharisees, and of the leaven of Herod,

In the mean time great multitudes of people being gathered together about Him, so that they trode upon one another, He began to say to his disciples, Beware of the leaven of the pharisees, which is hypocrisy: for there is nothing concealed,