Ecclesiastes 4:9-12

Two people are better than one, because they can reap more benefit from their labor. For if they fall, one will help his companion up, but pity the person who falls down and has no one to help him up. Furthermore, if two lie down together, they can keep each other warm, but how can one person keep warm by himself? Although an assailant may overpower one person, two can withstand him. Moreover, a three-stranded cord is not quickly broken.