III. The Eucharist in the Economy of Salvation

1334
In the Old Covenant bread and wine were offered in sacrifice among the first
fruits of the earth as a sign of grateful acknowledgment to the Creator. But
they also received a new significance in the context of the Exodus: the
unleavened bread that Israel eats every year at Passover commemorates the haste
of the departure that liberated them from Egypt; the remembrance of the manna
in the desert will always recall to Israel that it lives by the bread of the
Word of God;¹⁵⁴ their daily bread is the fruit of the promised land,
the pledge of God’s faithfulness to his promises.
The “cup of blessing”¹⁵⁵ at the end of the Jewish Passover
meal adds to the festive joy of wine an eschatological dimension: the messianic
expectation of the rebuilding of Jerusalem. When Jesus instituted the
Eucharist, he gave a new and definitive meaning to the blessing of the bread
and the cup.

From The Catechism of the Catholic Church – rosary.team

Original Link: https://www.vatican.va/archive/ENG0015/__P3Z.HTM