The Pulpit Commentary - Isaiah 30:1-7
THE ALLIANCE WITH EGYPT OPENLY REBUKED . In the preceding chapter ( Isaiah 30:15 ) the design of the Jewish rulers to seek the alliance of Egypt was covertly glanced at and condemned; now it is openly declared and rebuked. The rulers are warned that no good can possibly come of it, even in a worldly sense. The Egyptians will give no aid, or at any rate no effectual aid. The sums expended in purchasing their friendship will be utterly thrown away. read more
Adam Clarke's Commentary on the Bible - Isaiah 30:7
Their strength is to sit still "Rahab the Inactive" - The two last words, שבת הם hem shabeth , joined into one, make the participle pihel המשבת hammeshabbeth . I find the learned Professor Doederlein, in his version of Isaiah, and note on this place, has given the same conjecture; which he speaks of as having been formerly published by him. A concurrence of different persons in the same conjecture adds to it a greater degree of probability. read more