What is the purpose of the Lord's Supper?
The Lord's Supper is a memorial of Christ's death, proclaiming it until He returns. It involves bread representing His broken body and cup representing His blood, the New Testament in His blood. Believers partake in remembrance of Him, showing His death until He comes.
Les explains that the Lord's table of the bread and the cup is a memorial of His death. At the night of the last Passover, the eleven did not understand it, and Jesus did not explain it because it was not yet time. Paul writes in 1 Corinthians 11:23-26 that Jesus took bread, gave thanks, broke it, and said, "Take, eat, this is my body, which is broken for you; this do in remembrance of me." Likewise the cup is the New Testament in His blood, to be drunk in remembrance of Him. Verse 26 gives the explanation: as often as you eat this bread and drink this cup, you show the Lord's death until He comes. Les says this is the purpose of the Lord's Supper: nothing more and nothing less than a remembering of what Christ accomplished on the cross—His body broken and His blood poured out.
For as often as ye eat this bread, and drink this cup, ye do shew the Lord’s death till he come.