John Wesley on 2 Kings 19:29

A sign - Of the certain accomplishment of the promises here made: that God will not only preserve the city from his present fury, but also, bless his people with a durable prosperity, ver.30,31. The third year - This was an excellent sign; especially, considering the waste and havock which the Assyrians had made in the land; and that the Jews had been forced to retire into their strong hold, and consequently to neglect their tilling, and sowing, and reaping; and yet this year they should have sufficient provision from those fruits of the earth which the Assyrians left; and the second year, which was the year of release, in which they might neither sow, nor reap, from such fruits as the earth brought forth of its own accord; and so in the third year. And eat - You shall not sow, and another reap, as lately you did; but you shall enjoy the fruit of your own labours.