Matthew 13:31-33
The Parable of the Mustard Seed
31 He put before them another parable: “The kingdom of heaven is like a mustard seed that someone took and sowed in his field; 32 it is the smallest of all the seeds, but when it has grown it is the greatest of shrubs and becomes a tree, so that the birds of the air come and make nests in its branches.”
The Parable of the Yeast
33 He told them another parable: “The kingdom of heaven is like yeast that a woman took and mixed in with[a] three measures of flour until all of it was leavened.”
https://www.biblegateway.com/passage/?search=Matthew+13%3A31-33%2CMatthew+13%3A44-52&version=NRSV