From Jesus' institution of the memorial until Paul's exposition of it as the Lord's Supper, the ritual known as Communion seems to have developed significant qualities. For Jesus the rite was associated with the tradition of Passover in what appears to be a type/antitype relationship. The OT solemn ritual prefigured the sacrifice of Christ within its symbolic rehearsal of the Passover miracle. Though the entire ritual can be shown to point to Christ, Jesus recast those elements within the meal (bread and wine) which in particular served to reference his sacrifice over and above the Exodus miracle.
Only the elements Christ recast were mandated as the Christian memorial. The rest of Passover's symbology was jettisoned, the Jewish feast not carried over into NT practice. Some twenty years later, Paul seemingly strengthened the spiritual nature of the meal, invoking a mysterious (rather than merely sacred quality), by claiming that unfortunate consequences result when one mishandles it. The offense involved is against the body and blood of Christ, not against mere decorum, and could result in death.