Where did the Old Covenant end ?

Hi to all , and this one just one reason that Jesus came to die .

I know that all will say that He came to die for all the world and pay all the human sins , and have never seen this as and OP anywhere .

In Heb 9:14 , He purges their conscience from dead works !!! In Heb 6:1 , he is talking to Israel .

Then in verse 15 , " that by means of death , for the redemption of the transgressions that were UNDER ( or sins under the first Covenant ) the First
Testament or the Old Covenant .

As I have said that this just ONE of the reasons that Christ came to die .

So , to me that means that Old Covenant sins were paid at the Cross , but Israel was NOT SET aside , until Acts 28:28 !