Musnad Ahmad 30:1566

Sulayman narrated to us, Isma'il informed us, Muhammad informed me that he heard Abu 'Abd Allah al-Quraz calling out in the mosque, saying: Abu Hurayrah informed me that the Prophet, may Allah bless him and grant him peace, said: "Whoever intends evil for the people of Medina, Allah will dissolve him just as salt dissolves in water."