Journey to Easter: The Last Supper

The scene was popularized in "The Last Supper," late 15th-century mural painting by Leonardo da Vinci in the refectory of the Convent of Santa Maria delle Grazie, Milan, Italy.

The Last Supper, most likely a feast of Passover, is the preparation of the disciples for the departure of Jesus. He predicts the betrayal (by Judas) and denial (by Peter) and is scriptural foundation for the Eucharist or Holy Communion. 

The Holy Communion is an observance or sacrament practiced by all most all Christians that is reenacted in accordance with Jesus' instructions, per catholicity.com:

He took bread, blessed and broke it, and giving it to His apostles, said: "Take and eat; this is My body"; then He took a cup of wine, blessed it, and giving it to them, said: "All of you drink of this; for this is My blood of the new covenant which is being shed for many unto the forgiveness of sins"; finally, He gave His apostles the commission: "Do this in remembrance of Me."

And having taken bread, he gave thanks and broke it, and gave it to them, saying, "This is my body, which is being given for you; do this in remembrance of me." In like manner he took also the cup after the supper, saying, "This cup is the new covenant in my blood, which shall be shed for you." (Luke 22:19-20)