Ecclesiastes 4:9-12

Two are better than one because they have a good reward for their efforts.

For if either falls, his companion can lift him up;

but pity the one who falls without another to lift him up. Also, if two lie down together, they can keep warm; but how can one person alone keep warm? And if someone overpowers one person, two can resist him. A cord of three strands is not easily broken.