Musnad Ahmed: Hadith 4178

When The Messenger of Allah (ﷺ) saw Quraish displaying a stubborn attitude towards him, he said: "O Allah, help me against them with seven (years of hardship) like the seven of Yoosuf." Then they were affected with a famine that consumed everything until they ate animal skins and bones. One of them said: so they ate animal skins and dead meat, and there would come out of a man something like smoke. Then Abu Sufyan came to him and said. O Muhammad, your people are dying pray to Allah to grant them relief. So he prayed for them, then he said: "O Allah, if they go back (to their stubbornness), bring back (the punishment)." - This is in the hadeeth of Mansoor. - Then he recited this verse: "Then wait you for the Day when the sky will bring forth a visible smoke" (ad-Dukhan 44.10)