Historicity
Some scholars consider the Lord's supper to have derived not from Jesus' last supper with the disciples but rather from the gentile tradition of memorial dinners for the dead. In this view, the Last Supper is a tradition associated mainly with the gentile churches that Paul established, rather than with the earlier, Jewish congregations.
Luke is the only Gospel in which Jesus tells his disciples to repeat the ritual of bread and wine. Bart D. Ehrman states that these particular lines do not appear in certain ancient manuscripts and might not be original to the text.
However, many early Church Fathers have attested to the belief that at the Last Supper, Christ made the promise to be present in the Sacrament of the Eucharist, with attestations dating back to the first century AD. The teaching was also affirmed by many councils throughout the Church's history.
Read more about this topic: Last Supper