It is narrated from Sayyiduna al-Sa'ib bin Khallad (may Allah be pleased with him), through his descendants, that the Messenger of Allah (peace and blessings be upon him) said: "Whoever frightens the people of Madinah, Allah, the Mighty and Majestic, will frighten him on the Day of Resurrection, will curse him, will be angry with him, and will accept from him neither voluntary worship nor obligatory."
Hadith Referenceالمعجم الكبير للطبراني / باب السين / 6607