[There has been some confusion, both from us Jews and from people who call themselves Christians.  No book is the "New Testament" or the "New Covenant".  The book commonly called by those names is simply a revealing of the New Covenant.]

Our G-d made covenants with us through Noah, Abraham, Isaac, Jacob and Moses.

The Torah tells in Sh'mot (Exodus)2:24 that G-d heard our groaning, and he remembered his covenant with Abraham, with Isaac, and with Jacob.  He heard us and helped us get out of Egypt, because he had a covenant with our fathers. 

Sh'mot (Exodus) 24:7-8  And Moses took the scroll of the covenant, and read in the audience of the people: and they said, All that the Lord has said will we do, and be obedient. And Moses took the blood, and sprinkled it on the people, and said, "Behold the blood of the covenant, which the Lord has made with you concerning all these words."

Notice here in the Torah it speaks of "the blood of the covenant". 

In in Yesha'yahu (Isaiah 61:8) G-d says that he WILL make an everlasting covenant with us.  Another covenant!  Hmm, he WILL make...

In Yirmeyahu (Jeremiah) 31:31 We can see again that the Lord says he will make a New Covenant with the house of Israel, and with the house of Judah. 

That's us right? When? What New Covenant did he make after Yirmeyahu (Jeremiah) 31:31?

We saw above how Moses actually sprinkled blood on the people and mentioned the blood of the covenant. 

At the time the Lord gave us instructions connected with the covenant he made with us through Moses.  Sh'mot (Exodus) 34:33-35 tells us that when Moses spoke to us at that time he had a veil on his face.  

In 2 Corinthians 3:14,  it says that our minds are not perceiving everything because there is still a veil when the old covenant is read. In the Messiah the veil is taken away.  

Remember Moses mentioned the blood of the covenant? 

We have been blinded by that spiritual veil to the fact that we need blood in connection with a covenant with G-d.  

Yirmeyahu (Jeremiah) 31:33-34 says, " But this will be the covenant that I will make with the house of Israel; After those days, says the Lord, I will put my law in their inward parts, and write it in their hearts; and will be their God, and they shall be my people. And they shall teach no more every man his neighbor, and every man his brother, saying, Know the LORD: for they shall all know me, from the least of them unto the greatest of them, says the Lord: for I will forgive their iniquity, and I will remember their sin no more."

This is why in the letter to the Hebrews, it is written, "how much better is the covenant of which Yeshua has become guarantor.  Because the LORD will remember our sin no more."

While Yeshua was having his last seder, in Mattityahu 26:38, he picked up the cup of redemption said the barucha, and "this is my blood, which ratifies the New Covenant, my blood shed on behalf of many, so that they may have their sins forgiven." 

Maybe you think you have no sin? You need to read the 10 commandments and swing out of denial and back into reality.   

Isn't it time you asked the G-d of Abraham, Isaac and Jacob if Yeshua is the the Messiah of Israel?