Verse 8. "Let man and beast be covered" - This was done that every object which they beheld might deepen the impression already made, and cause them to mourn after a godly sort. Virgil tells us that the mourning for the death of Julius Caesar was so general, that the cattle neither ate nor drank:-
Non ulli pastos illis egere diebus Frigida, Daphni, boves ad flumina: nulla neque amnem Libavit quadrupes, nec graminis attigit herbam. Ecl. v. 24.
"The swains forgot their sheep, nor near the brink Of running waters brought their herds to drink.
The thirsty cattle of themselves abstain'd, From water, and their grassy fare disdain'd." DRYDEN.
And that they sometimes changed: or reversed the harness and ornaments of cattle, as indicative of mourning, we have a proof in Virgil's description of the funeral procession in honour of Pallas, slain by Turnus, AEn. xi. ver. 89.
Post bellator equus, positis insignibus, AEthon It lacrymans, guttisque humectat grandibus ora.
"Stripp'd of his trappings, and his head declined, AEthon, his generous warrior-horse, behind, Moves with a solemn, slow, majestic pace; And the big tears come rolling down his face."
Verse 9. "Who can tell if God will turn and repent" - There is at least a peradventure for our salvation. God may turn towards us, change his purpose, and save us alive. While there is life there is hope; God has no pleasure in the death of sinners; he is gracious and compassionate. Himself has prescribed repentance; if we repent, and turn to him from our iniquities, who knows then whether God will not turn, &c.
Verse 10. "And Gods saw their works" - They repented, and brought forth fruits meet for repentance; works which showed that they did most earnestly repent. He therefore changed his purpose, and the city was saved. The purpose was: If the Ninevites do not return from their evil ways, and the violence that is in their hands, within forty days, I will destroy the city. The Ninevites did return, &c., and therefore escaped the threatened judgment. Thus we see that the threatening was conditional.