Matthew 16:12
Then they understood that He meant, guard yourselves not against yeast for bread, but against the teaching of the Pharisees and the Sadducees.
Matthew 26:26
While they were eating, Jesus took a loaf and blessed it; then He broke it in pieces and gave it to the disciples, and said, "Take this and eat it; this is my body."
John 6:52-57
But the Jews kept on wrangling with one another and saying, "How can He give us His flesh to eat?"
1 Corinthians 5:6-8
Your ground for boasting about such a case is not good. Are you not aware that a little yeast will change the whole lump of dough?
Galatians 5:9
A little yeast will transform the whole dough.
1 Thessalonians 1:6
And you followed the example set by us and by the Lord, because you welcomed our message with a joy inspired by the Holy Spirit, in spite of the painful persecutions it brought you,