It is narrated from Sayyiduna Salman al-Farisi (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "Souls are like assembled troops: those that recognise one another become intimate, and those that do not recognise one another differ."
Hadith Referenceالمعجم الكبير للطبراني / باب السين / 6144
Through the same chain it is narrated that the Messenger of Allah (peace and blessings be upon him) said: "When speech becomes widespread and deeds are hidden away, when tongues agree with one another while hearts hate one another, and when every relative cuts off ties with his relative, at that time Allah will curse them, make them deaf and blind their eyes."
Hadith Referenceالمعجم الكبير للطبراني / باب السين / 6145