Abu Hurairah (RA) reported that Abu'I-Qasim (Muhammad, may peace be upon him) said: He who intends to do harm to the people of this city (that is, Madinah) Allah would efface him as salt is dissolved in water.
Abu Hurairah (RA) reported Allah's Messenger (ﷺ) as saying: He who intends to do harm to its people (he meant Madinah), Allah would efface him as salt is dissolved in water. Ibn Hatim (one of the narrators) substituted the word "harm" for "mischief".
Sa'd bin Abu Waqqas reported Allah's Messenger (ﷺ) as saying: He who intends to do harm to the people of Madinah, Allah would efface him just as water dissolves salt.