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Isaiah 8:2
The names of the righteous are recorded in books.
Isaiah 8:3
Isaiah's wife (who was also a mother) must have had some great spiritual strength, to be called a prophetess (Alma 32:23). Or the designation could simply mean "wife of a prophet".
Isaiah 8:4
The spoils of Samaria are the conquered people and wins from the campaign against Israel. 2 Kings 15:29, "carried them captive to Assyria".
In the New Testament, the Lord sent a blind man to wash in the pool of Siloam, and he was healed. The wathers of Shiloah must have been a commonly known geographic location, for it is referenced a few times (John 9:7,11). I imagine it was a peaceful place.
Isaiah is using an analogy of bodies of water. Because Judah has rejected Jehovah ("the waters .. that go softly"), they will be flooded with a river (Assyria) that will overflow its own boundaries and cover the lands.
I like the way he describes it:
It is interesting to note the differences in punctuation in 2 Nephi 18.
I wonder why he says "even the king of Assyria and all his glory." Why does he mention the king, and not just the nation? Was he a notorious leader?