19:35-37 That night which followed the sending of this message to Hezekiah, the main body of their army was slain. See how weak the mightiest men are before Almighty God. Who ever hardened himself against Him and prospered? The king of Assyria's own sons became his murderers. Those whose children are undutiful, ought to consider whether they have not been so to their Father in heaven? This history exhibits a strong proof of the good of firm trust and confidence in God. He will afflict, but not forsake his people. It is well when our troubles drive us to our knees. But does it not reprove our unbelief? How unwilling are we to rest on the declaration of Jehovah! How desirous to know in what way he will save us! How impatient when relief is delayed! But we must wait for the fulfilling of his word. Lord, help our unbelief.

2Ki 19:35, 36. An Angel Destroys the Assyrians.

35. in the morning … they were all dead corpses—It was the miraculous interposition of the Almighty that defended Jerusalem. As to the secondary agent employed in the destruction of the Assyrian army, it is most probable that it was effected by a hot south wind, the simoon, such as to this day often envelops and destroys whole caravans. This conjecture is supported by 2Ki 19:7 and Jer 51:1. The destruction was during the night; the officers and soldiers, being in full security, were negligent; their discipline was relaxed; the camp guards were not alert, or perhaps they themselves were the first taken off, and those who slept, not wrapped up, imbibed the poison plentifully. If this had been an evening of dissolute mirth (no uncommon thing in a camp), their joy (perhaps for a victory), or "the first night of their attacking the city," says Josephus, became, by its effects, one means of their destruction [Calmet, Fragments].