It has been reported on the authority of Barra' who said:
The Messenger of Allah ( صلی اللہ علیہ وسلم ) was carrying the earth with us on the Day of Ahzab and the whiteness of his belly had been covered with earth. (While engaged in this toil) he was reciting: By God, if Thou hadst not guided us We would have neither been guided aright nor practised charity, Nor offered prayers. Descend on us peace and tranquillity. Behold I these people (the Meccans) refused to follow us. According to another version, he recited: The chieftains (of the tribes) refused to follow us When they contemplated mischief, we rejected it. And with this (verse) he would raise his voice.