The fatal siege of Samaria (724-722 B.C.) seems to have given occasion to chap. xxviii.; but the following On the question of the Isaianic origin of the prophecy, ix.
The comparative feebleness of the style has led to the conjecture that, even if the basis of the prophecy be Isaianic, yet in its present form it must have undergone the manipulation of a scribe.
It should be added that the Isaianic origin of the appendix in xix.
The question of the Isaianic or non-Isaianic origin of the disputed prophecies (especially xl.-lxvi.) must be decided on grounds of exegesis alone.
[True, there was not so much said about Babylon as we should have expected even in the first book; the paucity of references to the local characteristics of Babylonia is in fact one of the negative arguments urged by older scholars in favour of the Isaianic origin of the prophecy.] Israel himself, with all his inconsistent qualities, becomes the absorbing subject of the prophet's meditations.
Non- Isaianic Elements in Chaps.
Even rarer than these rare perceptions of the evidence of the quasi-historical books to their origin are such half-perceptions of the literary origin of the prophetical books as is betrayed by Ibn Ezra, who appears to question the Isaianic authorship of Is.
3 p. 172 sqq.) can be easily refuted by a reference to the Isaianic oracles.
On the whole, the question must be left open, and with it both the problem of the extension of the name Musri and Mizraim outside Egypt in the Assyrian and Hebrew records of this period and the true historical background of a number of the Isaianic prophecies.