Sahih Muslim Book 7, Hadith Number 3195.

Chapter : Allah will punish those who intend to do any harm to the citizens of Medina.

Abu Huraira reported Allah’s Messenger (may peace be upon him) as saying: He who intends to do harm to its people (he meant Medina), Allah would efface him as salt is dissolved in water. Ibn Hatim (one of the narrators) substituted the word “harm” for “mischief”.