The Parables of the Mustard Seed and the Yeast

³¹He told them another parable: "The kingdom of heaven is like a mustard seed, which a man took and planted in his field. ³²Though it is the smallest of all your seeds, yet when it grows, it is the largest of garden plants and becomes a tree, so that the birds of the air come and perch in its branches."
 ³³He told them still another parable: "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."
 ³⁴Jesus spoke all these things to the crowd in parables; he did not say anything to them without using a parable. ³⁵So was fulfilled what was spoken through the prophet:
   "I will open my mouth in parables,
      I will utter things hidden since the creation of the world.

Found in Matthew Chapter 13
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