Matthew 13:31-32
31 He gave them another parable [to consider], saying, “The kingdom of heaven is like a mustard seed, which a man took and sowed in his field; 32 and of all the seeds [planted in the region] it is the smallest, but when it has grown it is the largest of the garden herbs and becomes a tree, so that the birds of the air find shelter in its branches.”
Mark 4:30-34
30 And He said, “How shall we picture the kingdom of God, or what parable shall we use to illustrate and explain it? 31 It is like a mustard seed, which, when it is sown on the ground, even though it is smaller than all the [other] seeds that are [sown] on the soil, 32 yet when it is sown, it grows up and becomes larger than all the garden herbs; and it puts out large branches, so that the birds of the sky are able to make nests and live under its shade.”
33 With many such parables, Jesus spoke the word to them, as they were able to hear and understand it; 34 and He did not say anything to them without [using] a parable; He did, however, explain everything privately to His own disciples.
Luke 13:18-19
18 So this led Him to say, “What is the kingdom of God like? And to what shall I compare it? 19 It is like a mustard seed, which a man took and planted in his own garden; and it grew and became a tree, and the birds of the sky found shelter and nested in its branches.”