The Last Supper, Jesus' institution of Holy Communion, was eaten by Jesus and his disciples in the upper room (see Luke 22:7-38). They were celebrating the Jewish holiday of Passover, which remembers the way God saved his people Israel when they were enslaved in Egypt. The Passover meal used an unblemished lamb, which was sacrificed to be eaten. The blood of the lamb was put on the sides and tops of the doorframes of the houses where the lambs were eaten (see Exodus 12:1-20).
We Christians recognize that Jesus is the Lamb of God, whose blood was shed to pay for our sins. Jesus told his disciples, "This is my Body. This is My Blood." We recognize his body and blood in the sacrament of "The Lord's Supper" or "Holy Communion", as we eat and drink the bread and wine.
Here at Bethlehem and St. John Ev. Lutheran Churches, we remember the Last Supper by partaking together of Jesus' body and blood in the Lord's Supper. These are the words we use during worship, taken from Jesus in the Gospels and St. Paul in 1 Corinthians:
In the same way also, he took the cup after supper. And when he had given thanks, he gave it to the disciples, saying: "Take, drink. This cup is the new testament in my blood, which is shed for you for the forgiveness of sins. This do, as often as you drink it, in remembrance of me."