Jesus institued the Eucharistic celebration at the Passover before his death. There are a couple of scripture passages that tell of this supper but I’ll quote from Luke 22:
15 And he said to them, "I have eagerly desired to eat this *Passover *with you before I suffer.
19 And he took bread, gave thanks and broke it, and gave it to them, saying, “This is my body given for you; do this in remembrance of me.”
20 In the same way, after the supper he took the cup, saying, "This cup is the new covenant in my blood, which is poured out for you. (NIV)
I fail to know the problem undestand the verses here. Certainly Y’shua did not transubstationate Himself then and there. Second we understand Y’shua engaging a metaphor here:Metaphor; or Representation
A declaration that one Thing is (or represents ) another; or comparison by Representation.
We use a metaphor when we say of a picture “This is my father” or “This is my mother.”
While a simile says “All flesh is AS grass” (1 Pet I,24) the Metaphor carries the figure across at once and says All flesh IS grass.
The whole figure, in a metaphor, lies, in the verb substantive** “IS”** and not in either of the two nouns ; and it is a remarkable fact that, when a pronoun is used instead of one of the nouns ( as it is here), and the two nouns are of different genders , the pronoun is always made to agree in gender with that noun to which the meaning is carried across, and not with the noun from which it is carried and to which it properly belongs. This at once shows us that a figure is being employed; when the pronoun, which ought, by the laws of language, to agree in gender with its own noun which by Metaphor, represents it.
Here for example, the pronoun “this” (touto), is and is made to agree with “body” (soma),which is neuter and not with bread (artos) which is masculine.
This is ALWAYS the case with Metaphors.”
Figures of Speech Used in the Bible
Bullinger Baker
Now, we understand the Eucharistic celebration as the Jewish people understand the Passover, that we are commemorating this event as if we are there.
For Jews, it is to remember and participate in the Exodus at Passover as if you are there, for Catholics, it is to remember and participate in the Sacrifice at Calvary as if we are there.