It is narrated from Sayyiduna Abu Shurayh al-Ka'bi (may Allah be pleased with him) that the Prophet (peace and blessings be upon him) said: "By Allah, he does not believe! By Allah, he does not believe! By Allah, he does not believe!" The Companions said: Who is that, O Messenger of Allah? He (peace and blessings be upon him) said: "The one whose neighbour is not safe from his harms." The Companions said: What are his harms? He (peace and blessings be upon him) said: "His evil." (This is the wording of the narration of Asim bin Ali.)
Hadith Referenceالمعجم الكبير للطبراني / باب الهاء / 18707