When we lived in Albert Lea, my friend Steve would open the Sunday School with intriguing object lessons.  He might brings some kitchen utensils or other items to drive home important Biblical truth.  I do not have Steve’s talent for such things.  I once did an object lesson with a flashlight for a group, but more often my object lessons are impromptu.  For example, my boys might come up to me with their toys and I will use the toys to teach them some lesson, or I might be on a job site and use what we are working with as a conversation starter.  As we consider the Last Supper, we should understand that Christ used  a very important object lesson that we still repeat today.
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As Christ and His disciples gathered in the upper room they observed a very significant meal.  Understand that this was the evening right before Jesus would be crucified the next afternoon.  Further this was the time of the Passover celebration when the Hebrews would commemorate their deliverance from Egypt and the protection of their firstborn by God.  During that time no leaven was allowed and a special lamb would be killed.
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The Passover time actually lasted over a week, with the main meal observed after the lamb was killed, but all leaven disposed of the day before.  The Lord’s Supper seems to have occurred on the first meal after all that leaven was gone.  It is in such a setting that He brings forth a powerful object lesson, using items that He has right there before Him. 
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“And he took bread, and gave thanks, and brake it, and gave unto them, saying, This is my body which is given for you: this do in remembrance of me. Likewise also the cup after supper, saying, This cup is the new testament in my blood, which is shed for you.” (Luke 22:19-20)
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Christ had been teaching that He would die, but I don’t believe His disciples had really come to grips with that truth- that He would die as the ultimate Passover lamb- so He brings forth this very vivid object lesson. He tells them at the beginning that He will not be eating the Passover with them again until He suffers.  Then He shows that His body and blood will be given for us.
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Notice that He also gives a clear command.  That command is to repeat this object lesson and to remember Christ.  When He died that next day and rose again three days later, He provided forgiveness.  When He gave that object lesson, He was looking ahead to the cross, as we repeat it, we look back to what He has already done. 
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What He did on the cross was completed, it does not have to be redone each time we observe Communion.  We are simply repeating an object lesson to remind us of what He already did.  “By the which will we are sanctified through the offering of the body of Jesus Christ once.” (Hebrews 10:10)  Therefore, the Lord’s Supper does not forgive our sins, it is an illustration that helps us to remember that He forgave our sins.
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In Luke 22:19, we are told that Christ gave thanks.  That Greek word for “thanks” is “eucharisteo.”  I fear many observe Eucharist without even knowing what the word means.  May the meaning of the word remind us that we have much to be thankful for as we remember that Jesus Christ paid the penalty for our sins as He willingly went to the cross.  If you have not trusted Him as your Savior, do so today, and understand why this repeated object lesson is so precious to His followers.