XII.
(1) In that day thou shalt say... — The prophet becomes the psalmist of that new Exodus, and the hymn that follows is based upon the type of that in Exodus 15, though with less of local and historical colouring. He has been taught that confession must be blended with thanksgiving — that those only can rightly estimate the comfort which God gives who have first felt His wrath. The fact that the prophet appears as a psalmist was a natural result of the training of the schools of the prophets, as described in 1 Samuel 19:20, possibly also of his familiarity with the Temple service as a priest or Levite. The group of psalms ascribed to the sons of Korah presents so many parallelisms to the writings of Isaiah, and so obviously belongs to the same period, that we may reasonably think of him as having been associated with that goodly company. (See Introduction.)