There are several covenants spoken of in Tanakh.

 G-d promises Abraham and his descendants possession of the Land. 

This is a 'one-way' promise on the part of HaShem.

The covenant at Sinai is never declared to be 'unconditional'.

It is conditional. 

Notice the word "if" in Deuteronomy 28.

The new covenant mentioned in Jeremiah is said to be, "not like",  the covenant made when we were led out of Egypt.

In this covenant no conditions are laid down.

So we have gone from a covenant in which the blessings are dependent upon conduct,  to one in which we, who failed to obey the first covenant, now have Torah written in our hearts and we no longer have to do anything to be sure of the blessings.

In the covenant made at Sinai, atonement for sin had to be made. 

There had to be a yearly covering for sin. 

But, now HaShem says, 'their sins and iniquities I will remember no more'. 

This means that something happens which makes the atonement permanent instead of annual. 

So, something new must have happened.

That something was Yeshua’s shed blood upon the tree as a permanent atonement for our sins. 

Receive the permanent atonement that God has already supplied for you! 

Isn’t it time that you asked the God of Abraham, Isaac and Jacob if Yeshua is the Moshiach of Israel?