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.

Matthew 18:19-20

¹⁹ “Again, truly I tell you that if two of you on earth agree about anything they ask for, it will be done for them ^A)’> Father, just as you are in me and I am in you. ^C)’> ²² I have given them the glory that you gave me, ^E)’> —

Hebrews 10:25

And let us not neglect our meeting together, as some people do, but encourage and warn each other, especially now that the day of his coming back again is drawing near.

Hebrews 13:2′