Ecclesiastes 4:9-12

Two are better than one, because they have a good reward for their labor. For if they fall, the one will lift up his fellow; but woe to him that is alone when he falleth, and hath not another to lift him up. Again, if two lie together, then they have warmth; but how can one be warm alone? And if a man prevail against him that is alone, two shall withstand him; and a threefold cord is not quickly broken.