Matthew 13:31-32

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."
New Revised Standard Version Bible, copyright 1989, Division of Christian Education of the National Council of the Churches of Christ in the United States of America. Used by permission. All rights reserved.