Today and tomorrow's readings give the most direct treatment of communion in the Bible as a tradition observed from the beginning of the church. It seems in the early church communion/Lord's Supper was more a communal meal then the small taste of bread and juice we're used to today, even though the message is the same. In Corinth it seems that some folks in the community were economically comfortable while others were struggling. That sounds like many faith communities now too. Paul argues that if they don't bridge the divisions by truly sharing their meal with one another instead of looking out for themselves, they are not really eating the Lord's Supper. The sacrament is only a sacrament if we overcome our divisions.
God's blessings as we grow together,