The Kingdom of heaven is like yeast. Here the Kingdom is the yeast. A small amount of "old dough" was kept in a jar as a "starter." This was mixed with the flour as we use yeast today, to make it rise. Just a small pinch of yeast would spread throughout the whole bushel of flour, This is how the Kingdom/church is active in the world. (Kingdom/church see Matthew 16:18-19.)

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Old Testament