Ecclesiastes 4:9-12
[9] Two are better than one,
    because they have a good return for their labor:
[10] If either of them falls down,
    one can help the other up.
But pity anyone who falls
    and has no one to help them up.
[11] Also, if two lie down together, they will keep warm.
    But how can one keep warm alone?
[12] Though one may be overpowered,
    two can defend themselves.
A cord of three strands is not quickly broken.