The prophetic reading for Shmot is chosen from the writings of the prophet Isaiah. Isaiah witnessed the rise of Assyria as the major political power of the ancient world. Yet, G-d ultimately would redeem His people. The prophet offers the vision of the shofar, announcing the return of Israel to her land. "It shall come to pass on that day, that a great shofar shall sound. They shall come that were lost in the land of Assyria, and they that were dispersed in the land of Egypt. They shall worship the L-rd in the holy mountain in Jerusalem."
Isaiah, although from the southern kingdom of Judah, criticizes the Northern Kingdom of Samaria. The prophet shares the impending doom that will overtake the Northern Kingdom. However, the Israelites are oblivious to the threat of destruction. They reject the teaching of the prophet.
Isaiah claims that his simple truth will be absorbed slowly when it finally comes to fruition. "For it is precept by precept, precept by precept, line by line, line by line, here a little, there a little." The G-d of Israel will ultimately redeem His people.
The theme of the promise of redemption links the prophetic message of the Haftarah to the Torah selection from Exodus.