During the Jewish celebration of the Passover Seder, the seventh step to freedom, the head of household blesses the matzah (unleavened bread). As part of the thirteenth step, he blesses the third cup of wine, the cup of blessing and redemption, and all present drink it. During the Last Supper, Rabbi Yeshua used these two steps to institute the Sacrament of the Holy Eucharist.
During the traditional Passover Seder, in the fourteenth step, after the head of household leads all present in singing the hallel (praise) psalms (§ 113-118) he prays a blessing over the fourth cup, the hallel (praise) cup, also called the cup of praise, and declares the Seder finished. Our Catholic priests commemorate the end of the Holy Sacrifice of the Mass by declaring, “The Mass is ended. Go in peace.”
Rabbi Yeshua, leading his Passover celebration as head of household, led his shlikhim in singing the hallel psalms. But after that he did not drink the fourth cup with his shlikhim or end the Seder. Instead, he led the shlikhim out to the Mount of Olives Mt 26:30. So, later, on the same day in the Hebrew calendar, on the Cross, in the final minutes of his mortal life, he completed his Final Sacrifice. At the very last moment he drank the fourth cup of wine (vinegar is sour wine) and declared the Seder finished. “After this Jesus, knowing that all was now finished, said (to fulfill the scripture), ‘I thirst.’ A bowl full of vinegar stood there; so they put a sponge full of the vinegar on hyssop and held it to his mouth. When Jesus had received the vinegar, he said, ‘It is finished’; and he bowed his head and gave up his spirit” Jn 19:28–30. In this way Rabbi Yeshua made the Last Supper and the Sacrifice on the Cross one single Final Sacrifice.
Rabbi Yeshua was able to complete his Final Sacrifice all in one day because the Hebrew Calendar began and ended each day at sunset. He celebrated the Passover after sundown, and completed his Sacrifice on the following afternoon, before sundown.
After the Last Supper Rabbi Yeshua prayed at Gethsemane by moonlight, “Father, if it be possible, let this chalice pass from me” Mt 26:39. After being captured he asked Kefa, “Shall I not drink the chalice which the Father has given me?” Jn 18:11.
For more context see the Hebrew Calendar.