1 Chronicles 26:12

Overview - 1 Chronicles 26
The divisions of the porters.
13 The gates assigned by lot.
20 The Levites that had charge of the treasures.
29 Officers and judges.
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1 Chronicles 26:12  (King James Version)
Among these were the divisions of the porters, even among the chief men, having wards one against another, to minister in the house of the LORD.

That is, classes against each other. Ward formerly signified a class or division: we still apply the term to the different apartments in hospitals, and to the more extensive districts into which the city of London is divided.