What does the Bible say about the Word of God as leaven?

In Matthew 13:33, Jesus likens the kingdom of heaven to leaven that a woman hides in meal until the entire batch is leavened. This parable illustrates the powerful and pervasive impact of God's Word and grace in our lives. Just as leaven diffuses throughout the dough, so too does the Word of God permeate our hearts, affecting every aspect of our being—body, soul, and spirit. The comparison serves to remind us that the Word, when truly received, has the power to radically transform us, bringing spiritual vitality and a new nature in alignment with the divine.