7:11a All these sons of Jediael were heads of their families, mighty men of valor;

All Jediael’s sons were leaders of their families in their clans and strong/virtuous warriors.
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Jediael was the father of all these men. They were both chiefs of their clans and mighty fighting men.

7:11b there were 17,200 fit for battle.

⌊Jediael⌋ had 17,200 descendants in his family line who were strong warriors prepared for war.
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Seventeen thousand and two hundred (17,200) of them were listed/enrolled as brave soldiers ready for battle.
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There were 17,200 strong and skilled fighters who were ready to serve in the army.

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