Adam Clarke on Isaiah 41:27

The first shall say to Zion, Behold, behold them "I first to Zion gave the word, Behold they are here" - This verse is somewhat obscure by the transposition of the parts of the sentence, and the peculiar manner in which it is divided into two parallel lines. The verb at the end of the sentence belongs to both parts; and the phrase, Behold, they are here! is parallel to the messenger of glad tidings; and stands like it, as the accusative case to the verb. The following paraphrase will explain the form and the sense of it. "I first, by my prophets, give notice of these events, saying, Behold, they are at hand! and I give to Jerusalem a messenger of glad tidings."