Albert Barnes Commentary Isaiah 28:19

"As often as it passeth though, it shall take you; for morning by morning shall it pass through, by day and by night: and it shall be nought but terror to understand the message." — Isaiah 28:19 (ASV)

From the time that it goes forth it shall take you—It shall not delay, or be hindered, or put back. As soon as the judgment is sent forth from God, it shall come upon you.

For morning by morning—Continually; without intermission. It shall be like floods and tempests that have no intermission, that are repeated every day, and continued every night, until everything is swept before them.

And it shall be a vexation—It shall be an object of alarm, of agitation, of distress—זועה zevâ‛âh from זוע zûa‛—“to move oneself;” to tremble with alarm; to be troubled (Ecclesiastes 12:3); (Daniel 5:19); (Daniel 6:27); (Hebrews 2:7). Here it means that the calamity would be so great that it would fill the mind with horror only to hear of it. For similar expressions denoting the effect of hearing a report of the judgments of God, see (1 Samuel 3:11); (2 Kings 21:12); (Jeremiah 19:3).

The report—Margin, ‘Doctrine’ (see the note at Isaiah 28:9).