Isaiah 8:6 - Joseph Benson’s Commentary on the Old and New Testaments

Forasmuch as this people The people of Israel, of whom he last spake, and who are the chief subject of this whole prophecy; and who did rejoice, not only in their own king Pekah, but also in the assistance of so powerful an ally as Rezin was; refuseth Or, rather, despiseth, as the word מאס more properly, and most frequently, signifies; the waters of Shiloah that go softly That small and contemptible brook which ran gently (as little rivers generally do) by Jerusalem, and which is here opposed to the great rivers of Tigris and Euphrates, by which the Assyrian empire was fortified. By these waters of Shiloah, he intends the munitions and strength of the Jews, including the kingdom of David, and the divine protection and promise engaged to support it, all which their enemies despised. And, as the people of Judah, from a consideration of their own weakness, and a distrust of God's promises, applied for assistance to the Assyrians, they also might properly be said to despise or refuse these waters of Shiloah, although they could not be said to rejoice in Rezin and Remaliah's son. Here, therefore, the prophet assigns the reason which moved God to punish both the Ephraimites and the Jews by the Assyrians. They disbelieved his word, distrusted his protection, and confided in an arm of flesh, and therefore the Lord chastised them.