Luke 12:1

Meanwhile the people had come streaming towards Him by tens of thousands, so that they were trampling one another under foot. And now He proceeded to say to His disciples first, "Beware of the yeast of the Pharisees, that is to say, beware of hypocrisy.

James 3:17

The wisdom from above is first of all pure, then peaceful, courteous, not self-willed, full of compassion and kind actions, free from favouritism and from all insincerity.

1 Corinthians 5:7-8

Get rid of the old yeast so that you may be dough of a new kind; for in fact you *are* free from corruption. For our Passover Lamb has already been offered in sacrifice--even Christ.

Matthew 16:6-12

and when Jesus said to them, "See to it: beware of the yeast of the Pharisees and Sadducees,"

Mark 8:15-21

and when He admonished them, "See to it, be on your guard against the yeast of the Pharisees and the yeast of Herod,"

Luke 5:1

On one occasion the crowd was pressing on Him and listening to God's Message, while He was standing by the Lake of Gennesaret.

Luke 5:15

But all the more the report about Him spread abroad, and great multitudes crowded to hear Him and to be cured of their diseases;

Luke 6:17

With these He came down till He reached a level place, where there was a great crowd of His disciples, and a multitude of people from every part of Judaea, from Jerusalem, and from the sea-side district of Tyre and Sidon, who came to hear Him and to be cured of their diseases;

Luke 11:44

Alas for you! for you are like the tombs which lie hidden, and the people who walk over them are not aware of their existence."

Luke 12:56

Vain pretenders! You know how to read the aspect of earth and sky. How is it you cannot read this present time?

Acts 21:20

And they, when they had heard his statement, gave the glory to God. Then they said, "You see, brother, how many tens of thousands of Jews there are among those who have accepted the faith, and they are all zealous upholders of the Law.

1 Corinthians 15:3

For I repeated to you the all-important fact which also I had been taught, that Christ died for our sins in accordance with the Scriptures;

1 Peter 2:1

Rid yourselves therefore of all ill-will and all deceitfulness, of insincerity and envy, and of all evil speaking.

Treasury of Scripture Knowledge

Summary

In the mean time, when there were gathered together an innumerable multitude of people, insomuch that they trode one upon another, he began to say unto his disciples first of all, Beware ye of the leaven of the Pharisees, which is hypocrisy.

Bible References

First

1 Corinthians 15:3
For I repeated to you the all-important fact which also I had been taught, that Christ died for our sins in accordance with the Scriptures;
James 3:17
The wisdom from above is first of all pure, then peaceful, courteous, not self-willed, full of compassion and kind actions, free from favouritism and from all insincerity.

Which

Luke 12:56
Vain pretenders! You know how to read the aspect of earth and sky. How is it you cannot read this present time?
Luke 11:44
Alas for you! for you are like the tombs which lie hidden, and the people who walk over them are not aware of their existence."
James 3:17
The wisdom from above is first of all pure, then peaceful, courteous, not self-willed, full of compassion and kind actions, free from favouritism and from all insincerity.
1 Peter 2:1
Rid yourselves therefore of all ill-will and all deceitfulness, of insincerity and envy, and of all evil speaking.

General references

Matthew 23:1
Then Jesus addressed the crowds and His disciples.
Luke 14:25
On His journey vast crowds attended Him, towards whom He turned and said,
Galatians 5:9
A little yeast corrupts the whole of the dough.