Is there evil in the city and the Lord hath not done it? - Evil is of two sorts, evil of sin, and evil of punishment. There is no other; for evil of nature, or evil of fortune, are evils, by God's Providence, punishing the evil of sin. Augustine, c. Adim. 26: "Evil, which is sin, the Lord hath not done; evil, which is punishment for sin, the Lord bringeth." The Providence of God governing and controlling all things, man doth ill which he wills, so as to suffer ill which he wills not. Only, evil which is by God's Providence the punishment of sin is in this life remedial and through final impenitence alone becomes purely judicial.
Rib.: "Refer not, the prophet would say, the ills which ye suffer and will suffer, to any other causes, as people are accustomed to do. God, in His displeasure, sends them upon you. And that ye may know this the more certainly, whatever He shall send He will first reveal to the prophets and by them ye shall be forewarned. See then that ye despise not my words, or the words of the other prophets. People ascribe their sufferings to fortune, accident, any cause, rather than the displeasure of God. The intemperate will think anything the cause of their illness rather than their intemperance. People love the things of the world and cannot and will not be persuaded that so many evils are brought on them by the things which they love. So then God explains through the prophets the punishment which He purposes to bring on people."

Shall a trumpet be blown - The sign of alarm and invasion.
And the people not be afraid? - Not take the alarm, and provide for their defense and safety?
Shall there be evil in a city - Shall there be any public calamity on the wicked, that is not an effect of my displeasure? The word does not mean moral evil, but punishment for sin; calamities falling on the workers of iniquity. Natural evil is the punishment of moral evil: God sends the former when the latter is persisted in.

(f) Shall a trumpet be blown in the city, and the people not be afraid? shall there (g) be evil in a city, and the LORD hath not done [it]?
(f) Will the Prophet's threaten God's judgments and the people not be afraid?
(g) Does any adversity come without God's appointment? (Isaiah 45:7)

Shall a trumpet be blown in the city,.... Meaning not any trumpet blown, as the silver trumpet for the gathering of the people to worship, or the jubilee trumpet, which proclaimed liberty to them, or any other, expressive of joy and gladness; but the sound of the trumpet, the alarm of war, or what is blown by the watchmen on the walls, descrying an enemy, or some danger, near:
and the people not be afraid? they must, they usually are, lest their lives, and their children's, should be taken away, and their substance become a prey to the enemy: or, "and the people not run together" (f); into some one place for shelter, or to consult together how to provide for their safety, and secure themselves from danger. So when the prophets of the Lord, by his order, lift up their voice like a trumpet, to show his people their transgressions; or when, as watchmen, they blow the trumpet, to give notice of approaching danger; can they hear such denunciations of his wrath for their sins, and not tremble at them, or not take some ways and methods to escape it?
shall there be evil in a city, and the Lord hath not done it? which is not to be understood of the evil of sin, of which God is not the author, it being contrary to his nature and will; and though he permits it to be done by others, yet he never does it himself, nor so much as tempts men to it, James 1:13; unless the words should be rendered, as they may be, "shall there be evil in a city, and shall not the Lord do" or "work" (g)? shall sin be committed in a city, all sorts of sin, in the most bold and extravagant manner, and will not the Lord do something to show his resentment of it? is it not time for him to arise and work for his name's sake? will he not visit for these things, and be avenged on such a city, and the inhabitants of it? but this may be interpreted of the evil of affliction or judgment; which, wherever it comes, is by the order and appointment of God, and is inflicted by him; thus evil, as well as good, comes out of the mouth and hand of the most High; and he creates the evil of adversity, as well as makes peace and prosperity; see Job 2:10.
(f) "non accurrit", Drusius, Tarnovius. (g) "and shall not the Lord do somewhat?" margin of our Bibles.

When the sound of alarm is trumpeted by the watchman in the city, the people are sure to run to and fro in alarm (Hebrew, literally). Yet Israel is not alarmed, though God threatens judgments.
shall there be evil in a city, and the Lord hath not done it?--This is the explanation of the preceding similes: God is the Author of all the calamities which come upon you, and which are foretold by His prophets. The evil of sin is from ourselves; the evil of trouble is from God, whoever be the instruments.

Afraid - Affected with the danger. Evil - Such as plague or famine. Done it - Either immediately by his own hand, or by the hands of those he employs. Whoever are the instruments, God is the principal agent. Out of his mouth both good and evil proceed.