(401) بَابُ الأرْوَاحُ جُنُودٌ مُجَنَّدَةٌ
Abu Hurayra reported that the Messenger of Allah, may Allah blesshim and grant him peace, said, "The spirits are massed armies. Those ofthem that knew one another are friendly. Those that did not know one anotherdisagree."
Reference: Al-Adab Al-Mufrad 901
In-book reference: Book 38, Hadith 14
English translation: Book 38, Hadith 901