The Teacher in Ecclesiastes says:

"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; for he hath not another to help him up.

Again, if two lie together, then they have heat: but how can one be warm alone?

And if one prevail against him, two shall withstand him; and a threefold cord is not quickly broken."