The Lords supper is an ordinance of the church..instituted by Christ and to be kept untill that marriage supper of the LAMB:>)
But remember that the passover was also an ordinance given to the Jews as a memorial...
This was give to us as a time to stop and consider the Love of God and His body broken for us and his holy blood shed for the remission of my sin>
But unless you see the fulness of the connection between the Passover and the Lords supper you miss the spitirual meaning
1.Sacrificial meal. The Passover consisted of both a sacrifice and a meal, and was the most important of all the sacrificial meals. A lamb was sacrificed as an atonement for sin. The lamb was then roasted and eaten at a meal with unleavened bread. Ex 12:8-10 "For Christ our Passover lamb, has been sacrificed. Therefore let us keep the Festival, not with the old yeast...but with bread without yeast, the bread of sincerity and truth." 1Cor 5:7b-8
2.Seal of the covenant. As a commemoration, Passover was also an affirming of the covenant between God and Israel, strengthening of the allegiance. Jesus speaks of the cup as a sign of the covenant, which was about to be ratified through his sacrificial death "This cup is the new covenant in my blood" Lk 22:19
3.Bread and wine. According to ancient Jewish records, near the end of the Passover meal, the head of the company would take the cake of unleavened bread and pronounce these words- "This is the bread of misery which our fathers ate in the land of Egypt." Christ substituted for these words, the words of institution "This is my body, broken for you.." Then the cup was filled the third time and raised to God in thanksgiving. It was called by the Jews, the cup of blessing, the same term that Paul uses to refer to the communion cup.
To those of us that do not see it as the actual body in substance we see it as a Holy moment of the sealing of the New Covenant..
OT covenants were sealed with meals.. Mar 14:24 And he said unto them, This is my blood of the new testament, which is shed for many.
The listeners knew how a covenant was cut..as can anyone chosing to take the time to study the OT
Two of them were making a feast Gen 26:30 , and by offering a sacrifice Gen 15:9-17; Jer 34:18,19 were two of the methods..
They also would have understood Jesus saying that He was the Bread of Life..(Manna...that came down from heaven)John 6:35 And Jesus said unto them, I am the bread of life: he that cometh to me shall never hunger; and he that believeth on me shall never thirst.
unlike the Jews in the desert that had to gather manna everyday to live,He was also sent from heaven..but they would never hunger again.
John 6:51 I am the living bread which came down from heaven: if any man eat of this bread, he shall live for ever: and the bread that I will give is my flesh, which I will give for the life of the world.
They understood the comparison he was making ...
And someday the saints will share that meal
Rev 2:17 He that hath an ear, let him hear what the Spirit saith unto the churches; To him that overcometh will I give to eat of the hidden manna, and will give him a white stone, and in the stone a new name written, which no man knoweth saving he that receiveth [it].
It is holy to all of us!