Mark 3:31-35
31 And his mother and his brothers came, and standing outside they sent to him and called him. 32 And a crowd was sitting around him, and they said to him, “Your mother and your brothers are outside, seeking you.” 33 And he answered them, “Who are my mother and my brothers?” 34 And looking about at those who sat around him, he said, “Here are my mother and my brothers! 35 For whoever does the will of God, he is my brother and sister and mother.”
What unites us and what keeps the church community strong is not our hobbies, our church activities but the convictions of our faith in Christ and His cause.
For Jesus to say that his brothers and sisters are those doing the will of God is communicating how important it is to walk in His ways. As we, of different background, worship and obey King Jesus, we are united in the spirit by that fact.
Again in this text, we can make a case on how important the local church is. We are not only called to be members of the community, but Jesus used a familial term to drive home the truth – you need to BELONG to a community where you can say that these are my brothers and sisters in the Lord.