Sahih Muslim | Book 32 | Chapter 47

Narrated by Abu Huraira
Abu Huraira reported Allah's Messenger (may peace be upon him) Saying: Souls are troops collected together and those who familiarised with each other (in the heaven from where these come) would have affinity, with one another (in the world) and those amongst them who opposed each other (in the Heaven) would also be divergent (in the world).

Narrated by Abu Huraira narrated directly from Allah's Messenger (may peace be upon him) that he
Abu Huraira narrated directly from Allah's Messenger (may peace be upon him) that he said: People are like mines of gold and silver; those who were excellent in Jahiliya (during the days of ignorance) are excellent In Islam, when they have, an understanding, and the souls are troops collected together and those who had a mutual familiarity amongst themselves in the store of prenatal existence would have affinity amongst them, (in this world also) and those who opposed one of them, would be at variance with one another.