What covenant did he confirm with the many?
Jeremiah 31:31-32, "Behold, the days are coming, declares the LORD, when I will make a new covenant with the house of Israel and the house of Judah, not like the covenant that I made with their fathers on the day when I took them by the hand to bring them out of the land of Egypt, my covenant that they broke, though I was their husband, declares the LORD."
Luke 22:19-21, "And he took bread, and when he had given thanks, he broke it and gave it to them, saying, "This is my body, which is given for you. Do this in remembrance of me." And likewise the cup after they had eaten, saying, "This cup that is poured out for you is the new covenant in my blood. But behold, the hand of him who betrays me is with me on the table."
Hebrews 8:8, "For he finds fault with them when he says: "Behold, the days are coming, declares the Lord,when I will establish a new covenant with the house of Israel and with the house of Judah,"
Hebrews 8:13, "In speaking of a new covenant, he makes the first one obsolete. And what is becoming obsolete and growing old is ready to vanish away."
Hebrews 9:15, "Therefore he is the mediator of a new covenant, so that those who are called may receive the promised eternal inheritance, since a death has occurred that redeems them from the transgressions committed under the first covenant."
Hebrews 12:24, "and to Jesus, the mediator of a new covenant, and to the sprinkled blood that speaks a better word than the blood of Abel."
Edit:
The covenant was to the Jews for the 70th week. Remember that Jesus ministry was a limited/selective ministry during His time on Earth. For example:
Matthew 10:5-7,
"These twelve Jesus sent out, instructing them, "Go nowhere among the Gentiles and enter no town of the Samaritans, but go rather to the lost sheep of the house of Israel. And proclaim as you go, saying, 'The kingdom of heaven is at hand."
Matthew 15:22-24,
"And behold, a Canaanite woman from that region came out and was crying, "Have mercy on me, O Lord, Son of David; my daughter is severely oppressed by a demon." But he did not answer her a word. And his disciples came and begged him, saying, "Send her away, for she is crying out after us." He answered, "I was sent only to the lost sheep of the house of Israel."
Jesus did heal non-Jews, but His ministry was focused on the Jews. During this 70th week, Jesus was "cut off" and then the gospel message was taken to the Gentiles.
What I find so impressive is Jesus' words in Luke 19:41-44, "And when he drew near and saw the city, he wept over it, saying, "Would that you, even you, had known on this day the things that make for peace! But now they are hidden from your eyes. For the days will come upon you, when your enemies will set up a barricade around you and surround you and hem you in on every side and tear you down to the ground, you and your children within you. And they will not leave one stone upon another in you, because you did not know the time of your visitation."
Why did Jesus call this "the time of your visitation"? Because Daniel prophesied that Jesus --the promised Messiah--would be there at this time and the Jewish people did not know it...even though Daniel told them.