Mark 4:31

It is like to a grain of mustard, which when it is sown upon the earth, though it is less than all the seeds that are upon the earth,

Matthew 13:31-33

Another parable He set before them, saying, "The Kingdom of Heaven is like a grain of mustard seed, which a man, having taken, sowed in his field:

Luke 13:18-19

And He said, "To what is the Kingdom of God like? and to what shall I liken it?

Acts 2:41

Those, therefore, who gladly received his word, were immersed; and there were added to them on that day about three thousand souls;

Acts 4:4

And many of those who heard the word believed; and the number of the men became about five thousand.

Acts 5:14

(and the more were believers being added to the Lord, multitudes both of men and women);

Acts 19:20

So mightily grew the word of God, and prevailed.

Acts 21:20

And they, hearing it, were glorifying God, and said to him, "You observe, brother, how many thousands there are among the Jews, of those who have believed; and they are all zealous for the law.

Revelation 11:15

And the seventh angel sounded; and there followed great voices in Heaven, saying, "The kingdom of the world became our Lord's and His Christ's; and He will reign forever and ever."

Revelation 20:1-6

And I saw an angel coming down out of Heaven, having the key of the abyss, and a great chain upon his hand.

Treasury of Scripture Knowledge

Summary

It is like a grain of mustard seed, which, when it is sown in the earth, is less than all the seeds that be in the earth:

Bible References

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Matthew 13:31
Another parable He set before them, saying, "The Kingdom of Heaven is like a grain of mustard seed, which a man, having taken, sowed in his field:
Luke 13:18
And He said, "To what is the Kingdom of God like? and to what shall I liken it?

Is less than

Acts 2:41
Those, therefore, who gladly received his word, were immersed; and there were added to them on that day about three thousand souls;
Acts 4:4
And many of those who heard the word believed; and the number of the men became about five thousand.
Acts 5:14
(and the more were believers being added to the Lord, multitudes both of men and women);
Acts 19:20
So mightily grew the word of God, and prevailed.
Acts 21:20
And they, hearing it, were glorifying God, and said to him, "You observe, brother, how many thousands there are among the Jews, of those who have believed; and they are all zealous for the law.
Revelation 11:15
And the seventh angel sounded; and there followed great voices in Heaven, saying, "The kingdom of the world became our Lord's and His Christ's; and He will reign forever and ever."
Revelation 20:1
And I saw an angel coming down out of Heaven, having the key of the abyss, and a great chain upon his hand.