Israel was under the covenant of the law and ten commandments as a school master until the fullness of the time of the Messiah came.
Christians are under grace, not the law, for Christ fulfilled all the law, so our duty, fulfilment of the law towards God was fulfilled in Christ and in Christ alone, not us.
However God expects us to live a moral, righteousness, holy life because of what Christ has done.. And not for our salvation, that has already been taken care of in Christ.
We honor the 10 commandments not for our earning our salvation, but because we honor God in it and honor Christ in it.
Amen
Well stated.