29 "And this shall be the sign for you: this year you shall eat what grows of itself, and in the second year what springs of the same; then in the third year sow, and reap, and plant vineyards, and eat their fruit. 30 And the surviving remnant of the house of Judah shall again take root downward, and bear fruit upward; 31 for out of Jerusalem shall go forth a remnant, and out of Mount Zion a band of survivors. The zeal of the Lord will do this.
Matthew Henry's Commentary on 2 Kings 19:29-31
Commentary on 2 Kings 19:20-34
(Read 2 Kings 19:20-34)
All Sennacherib's motions were under the Divine cognizance. God himself undertakes to defend the city; and that person, that place, cannot but be safe, which he undertakes to protect. The invasion of the Assyrians probably had prevented the land from being sown that year. The next is supposed to have been the sabbatical year, but the Lord engaged that the produce of the land should be sufficient for their support during those two years. As the performance of this promise was to be after the destruction of Sennacherib's army, it was a sign to Hezekiah's faith, assuring him of that present deliverance, as an earnest of the Lord's future care of the kingdom of Judah. This the Lord would perform, not for their righteousness, but his own glory. May our hearts be as good ground, that his word may strike root therein, and bring forth fruit in our lives.