Psalms 84:3 (KJV)
Yea, the sparrow hath found an house, and the swallow a nest for herself, where she may lay her young, [even] thine altars, O LORD of hosts, my King, and my God.
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And he said, So is the kingdom of God, as if a man should cast seed into the ground;
And should sleep, and rise night and day, and the seed should spring and grow up, he knoweth not how.
For the earth bringeth forth fruit of herself; first the blade, then the ear, after that the full corn in the ear.
But when the fruit is brought forth, immediately he putteth in the sickle, because the harvest is come.
And he said, Whereunto shall we liken the kingdom of God? or with what comparison shall we compare it?
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:
But when it is sown, it groweth up, and becometh greater than all herbs, and shooteth out great branches; so that the fowls of the air may lodge under the shadow of it.