ENOfficial
Abu Hurayra reported that the Messenger of Allah, may Allah bless him and grant him peace, said, "The spirits are massed armies. Those of them that knew one another are friendly. Those that did not know one another disagree."
Source: sunnah.com
Other translations
Arabic
حَدَّثَنَا عَبْدُ الْعَزِيزِ بْنُ عَبْدِ اللهِ قَالَ: حَدَّثَنِي سُلَيْمَانُ بْنُ بِلاَلٍ، عَنْ سُهَيْلٍ، عَنْ أَبِيهِ، عَنْ أَبِي هُرَيْرَةَ قَالَ: قَالَ رَسُولُ اللهِ صلى الله عليه وسلم: الأرْوَاحُ جُنُودٌ مُجَنَّدَةٌ، فَمَا تَعَارَفَ مِنْهَا ائْتَلَفَ، وَمَا تَنَاكَرَ مِنْهَا اخْتَلَفَ.
sunnah.com