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four thousand to do guard duty, and four thousand to praise the Lord, using the musical instruments provided by the king for this purpose.
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David divided the Levites into three groups, according to their clans: Gershon, Kohath, and Merari.
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Gershon had two sons: Ladan and Shimei.
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Ladan had three sons: Jehiel, Zetham, and Joel,
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who were the heads of the clans descended from Ladan. (Shimei had three sons: Shelomoth, Haziel, and Haran.)