9:25a Their relatives came from their villages at fixed times

Sometimes it was necessary for the relatives of the gatekeepers/doorkeepers to come and help them. Those relatives lived in their villages ⌊outside Jerusalem city⌋ .
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These guards were helped by their relatives who lived in the villages outside the city.

9:25b to serve with them for seven-day periods.

Each time some of them came, they helped the gatekeepers for seven days. (Translation for Translators)
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Every seven days ⌊a group of their relatives from the clan of Levi would come into Jerusalem city⌋ . They would help/assist them in the work ⌊of guarding the entrances/gates to the house of Yahweh⌋ .

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