Adam Clarke on Isaiah 8:19

Should not a people seek "Should they seek" - After ידרש yidrosh, the Septuagint, repeating the word, read הידרש hayidrosh: Ουκ εθνος προς Θεον αυτου εκζητησουσι; τι εκζητησουσι περι των ζωντων τους νεκρους; Should not a nation seek unto its God? Why should you seek unto the dead concerning the living? and this repetition of the verb seems necessary to the sense; and, as Procopius on the place observes, it strongly expresses the prophet's indignation at their folly.