Verse 19. - It is like a grain of mustard seed, which a man took, and cast into his garden; and it grew, and waxed a great tree; and the fowls of the air lodged in the branches of it. The simile was a well-known one in the Jewish world. "As small as a grain of mustard seed" was a proverb current among the people in those days. In Eastern countries this little seed often becomes a tree, and stories are even told of mustard trees so tall that a man could climb up into their branches or ride beneath them on horseback. Such instances are possibly very rare, but it is a common sight to see a mustard plant, raised from one of these minute grains, grown to the height of a fruit tree, putting forth branches on which birds build their nests. It was with sorrowful irony that the great Teacher compared the kingdom of God in those days to this small grain. The kingdom of God on earth then was composed of Jesus and his few wavering followers. To the eye of sense it seemed impossible that this little movement could ever stir the world, could ever become a society of mighty dimensions, "See," said the Master, taking up a little mustard seed; "does this seem as though it would ever become a tree with spreading branches on which the birds might rest? The kingdom of God is like this seed."

13:18-22 Here is the progress of the gospel foretold in two parables, as in Mt 13. The kingdom of the Messiah is the kingdom of God. May grace grow in our hearts; may our faith and love grow exceedingly, so as to give undoubted evidence of their reality. May the example of God's saints be blessed to those among whom they live; and may his grace flow from heart to heart, until the little one becomes a thousand.It is like a grain of mustard seed,.... Both for its smallness at first, and its after increase; wherefore both the Evangelists Matthew and Mark observe, that it "is the least of all seed": which is true of the ministry of the Gospel, of the Gospel church state, and of the grace of God in the hearts of his people:

which a man took and cast into his garden; the Ethiopic version renders it, "and sowed in his field", as in Matthew 13:31 though mustard used to be sowed in gardens as well as in fields. (x) Says R. Simeon ben Chelphetha, I have one stalk of mustard seed, , "in my garden": so (y) Buxtorf translates it. And by the place in the text, where this seed is cast, may be meant, either the "field" of the world, where the Gospel is preached, and churches are raised; or the "garden" of the church, where the word and ordinances are administered, and in the hearts of the members of it, the grace of God is implanted and increased; see Sol 4:12

and it grew and waxed a great tree, which may design the spread of the Gospel in the world, the flourishing state of the church of Christ, and the growth of grace in the hearts of believers.

And the fowls of the air lodged in the branches of it; the Syriac version reads in the singular number, "the fowl of the air"; not Satan, and his principalities and powers, which devour the seed sown by the wayside; nor the angels of heaven; but rather gracious men on earth, who sit under the shadow of a Gospel ministry with great delight; and "make their nests", as the Persic version here renders the words, and take up their residence in Gospel churches; See Gill on Matthew 13:31, Matthew 13:32, Mark 4:31, Mark 4:32.

(x) T. Hieros. Peah, fol 20. 2.((y) Lex. Talmud. col. 823.