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".
Related hadith on this topic
Explanation & Benefits
Maulana Ataullah Sajid
Benefits and Issues:
➊ Just as the sanctity of the Makkan Haram is obligatory, in the same way, the sanctity of the Madinan Haram is also obligatory.
➌ The one who violates the sanctity of the Haram will be afflicted with punishment in this world itself.
Source: Commentary on Sunan Ibn Mājah by Mawlānā ‘Atā’ullāh Sājid, Page: 3114