Ecclesiastes 4:9-12

Two are better than one, because they have a good [more satisfying] reward for their labor; For if they fall, the one will lift up his fellow. But woe to him who is alone when he falls and has not another to lift him up! Again, if two lie down together, then they have warmth; but how can one be warm alone? And though a man might prevail against him who is alone, two will withstand him. A threefold cord is not quickly broken.