4 occurrences in 4 dictionaries
Reference: Zer
Fausets
A fortified town of Naphtali (Jos 19:35). From the names which succeed in the list Zer is supposed to be S.W. of the lake of Gennesareth.
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Hastings
A 'fenced' city of Naphtali (Jos 19:35). It follows Ziddim (properly Hazziddim [with art.]), which may be the modern Hattin, N.W. of Tiberias. The identity of Zer is quite uncertain.
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Smith
(flint), a fortified town in the allotment of Naphtali,
only, probably in the neighborhood of the southwest side of the Lake of Gennesareth.