Numbers 4:21-23

And the LORD
<03068>

spake
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unto Moses
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saying
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Take
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also the sum
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of the sons
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of Gershon
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throughout the houses
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of their fathers
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by their families
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From thirty
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years
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old
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and upward
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until fifty
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years
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old
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shalt thou number
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them; all that enter in
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to perform
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the service
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to do
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the work
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in the tabernacle
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of the congregation
<04150>_.

{to perform...: Heb. to war the warfare}