Bruce: I am not decided one way or another. Calvin's point does seem undermined, to me at least, by the identification of Isaiah's sons as signs. So, the sign of the predicted pregnancy could refer to the child to be born.

Also, Isa. 8:8 seems to expressly identify Isaiah's son (or another contemporary of Isaiah) as Immanuel.

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Scott Roberts
Ruling Elder, Lakeside Presbyterian Church (PCA)
Southlake, Texas