The phrase "exhortation against" is correct and usable in written English.
It can be used when referring to a strong urging or encouragement to avoid or oppose something.
Example: "The speaker delivered an exhortation against the dangers of procrastination."
Alternatives: "appeal against" or "warning against".
Shafik is clearly frustrated that years of exhortations against bank misbehaviour have yet to trigger genuine cultural change.
If Americans know exercise is so good for them, why don't they take the message to heart as they did the exhortations against smoking?
I was greedy for one last gesture of love, one more moment of physical contact with a man who, despite his exhortations against mediocrity and his fierce expectations, was never stingy with his affection.
Despite exhortations against "judicial activism" from the previous administration, it's no secret that appointment of federal judges is political.
Trump has sucked up all the oxygen in the race thanks to his barn-burning rallies, insane public pronouncements, and thuggish exhortations against the media.
Fighting corruption is about more than exhortation: declaiming against those who steal and fail to honor their public responsibilities.
It is entirely at odds with Biblical admonitions and Prophetic exhortations warning against injustices committed by the privileged and the powerful against the stranger and the powerless.
It is an exhortation to push against convention and define oneself independent of society.
Zawahri's call for jihad against the Assad regime — Al Qaeda's first such exhortation that is not against the United States or a close U.S. ally — is both a testament to and a driver of these anti-Shiite and determinedly local dynamics.
He rebels against an exhortation at the entrance to the natural foods market Gaia (a barely disguised Whole Foods) to "Love Where You Shop": "Or what?
