Good grief, the Apostles were present at the Last Supper when Jesus instituted the Eucharist. Sorry you seem not to believe the Bible.....am I correct there?
Yeshua didn’t ‘institute’ any pagan eucharist!
He invoked the ancient blessing of the Melek Zedek, and commanded the disciples to remember him each time that they broke a loaf of bread and drank the wine.
That is what the word says.