Matthew 13:33-35

33 He told them another parable: “The kingdom of heaven is like yeast that a woman took and mixed in with three measures of flour until all of it was leavened.”

34 Jesus told the crowds all these things in parables; without a parable he told them nothing. 35 This was to fulfill what had been spoken through the prophet:

“I will open my mouth to speak in parables;
    I will proclaim what has been hidden from the foundation of the world.”