Yeasts are eukaryotic and can divide by a process called budding. Yeast, or leaven, is a powerful fungus that can cause a lump of dough to rise into bread, ferment liquids into alcohol, or cause painful infections. Sin is like yeast 1 Corinthians 5:6-7. He told them another parable. Yeast (or leaven) is a substance that people use in order to make bread. When Jesus spoke of yeast in His comments about the Pharisees and Herod (v. 15), His disciples were quite confused. 34 Bible Verses about Yeast. You only add a little yeast to the flour. What was the leaven of the Pharisees and Herod' Those who followed the Pharisees might demand signs, but they would gradually increase in unbelief until they had hardened hearts, just like the Pharisees. “The kingdom of heaven is like leaven that a woman took and hid in three measures of flour, till it was all leavened.” 1 Corinthians 5:6-7 ESV / 10 helpful votes Helpful Not Helpful. In seemingly the only positive usage of yeast in the Bible, Jesus says that the Kingdom of God / Kingdom of Heaven is like yeast (Matthew 13:33 and Luke 13:18-21). A final reference to yeast is in 1 Corinthians 5:6-8, where Paul uses yeast as a metaphor for boasting. Matthew 13:33 “The kingdom of heaven is like yeast that a woman took and mixed into a large amount of flour until it worked all through the dough.”(NIV) To understand this passage we need to look at how yeast grows. Jesus described this process in Matthew 13:33. What could He mean? The “yeast” or “leaven” of the Pharisees was the subtle yet pervasive influence the Pharisees exerted over people. The yeast grows and it spreads right through the flour. Matthew 13:33 ESV / 16 helpful votes Helpful Not Helpful. Bible and Science-Yeast, A Model of Church Growth.