5 Bible Verses about Sealing A Covenant

During the meal Jesus took a Passover biscuit, blessed it and broke it. He then gave it to the disciples, saying, "Take this and eat it: it is my body." And He took the cup and gave thanks, and gave it to them saying, "Drink from it, all of you; for this is my blood which is to be poured out for many for the remission of sins--the blood which ratifies the Covenant.read more.
I tell you that I will never again take the produce of the vine till that day when I shall drink the new wine with you in my Father's Kingdom."

Also during the meal He took a Passover biscuit, blessed it, and broke it. He then gave it to them, saying, "Take this, it is my body." Then He took the cup, gave thanks, and handed it to them, and they all of them drank from it. "This is my blood," He said, "which is to be poured out on behalf of many--the blood which makes the Covenant sure.read more.
I solemnly tell you that never again will I taste the produce of the vine till I shall drink the new wine in the Kingdom of God."

Then, having received the cup and given thanks, He said, "Take this and share it among yourselves; for I tell you that from this time I will never drink the produce of the vine till the Kingdom of God has come." Then, taking a Passover biscuit, He gave thanks and broke it, and gave it to them, saying, "This is my body which is being given on your behalf: this do in remembrance of me."read more.
He gave them the cup in like manner, when the meal was over. "This cup," He said, "is the new Covenant ratified by my blood which is to be poured out on your behalf.

For it was from the Lord that I received the facts which, in turn, I handed on to you; how that the Lord Jesus, on the night He was to be betrayed, took some bread, and after giving thanks He broke it and said, "This is my body which is about to be broken for you. Do this in memory of me." In the same way, when the meal was over, He also took the cup. "This cup," He said, "is the new Covenant of which my blood is the pledge. Do this, every time that you drink it, in memory of me."

and to Jesus the negotiator of a new Covenant, and to the sprinkled blood which speaks in more gracious tones than that of Abel.