It is narrated from Sayyidah Aisha (may Allah be pleased with her) that I heard the Prophet (peace and blessings of Allah be upon him) say: "Souls are like assembled troops; those who became acquainted and familiar with each other (in the realm before this world) will have affection and love for each other (in this world as well), and those who were not familiar with each other there will differ (in this world as well)."

Narrated from Sayyiduna Abu Hurairah (may Allah be pleased with him) that the Messenger of Allah (peace and blessings of Allah be upon him) said: "Souls are like gathered armies; those who became acquainted with one another, their affection developed (in this world), and those who did not become familiar, their differences arose (in this world)."