
Mary's friend, Kate, exudes welcome and hospitality wherever, whenever you see her. Despite the rain and sleet, the minute the door opened at Kate's house the spirit of Christian fellowship spilled out of the living space and flooded the porch.
And the apostles preached powerful sermons about the resurrection of the Lord Jesus, and there was warm fellowship among all the believers...
Acts 4: 33 TLB
Jesus alluded to the power He brings to fellowship in Matthew's gospel. Prayer can change things. When you gather with a small group of believers, it can change things in a big way.
When two of you get together on anything at all on earth and make a prayer of it, my Father in heaven goes into action. And when two or three of you are together because of me, you can be sure that I’ll be there.
Matthew 18:20 MSG

My prayer is that our fellowship with you as believers will bring about a deeper understanding of every blessing which we have in our life in union with Christ.
Philemon 1: 6 GNT
Did you grow up on "Friends", Dear Reader? Or would you just love to hang out with them in Monica's living room? Or maybe you are mostly clueless, like me. (Although, I wouldn't categorize myself as a Phoebe.)
Whatever category you're in, I think the theme song lyrics are just about perfect to describe fellowship that can happen when, as believers, we choose to gather together (whether our living room is as cool as Monica's or not).