Jesus transitioned the Passover dinner, from looking forward to Messiah, to looking back to his coming, through remembering Jesus as the fulfillment of that promise! That is what he called the New Covenant.

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And in the same way He took the cup after they had eaten, saying, “This cup which is poured out for you is the new covenant in My blood. Luke 22:20 NASB https://bible.com/verse-of-the-day/luk.22.20/51176