You're very welcome Mark. compute

Am I understanding you clearly?
Would you say that Cain murdering his brother Abel was not guilty of commiting a sin since he was not breaking a commandment of God, and so will not be held accountable?
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Genesis 4:7
If you do well, will you not be accepted?[1] And if you do not do well, sin is crouching at the door. Its desire is for you, but you must rule over it.

Also, how would you explain this verse in Genesis 8?
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Genesis 8:21 And when the Lord smelled the pleasing aroma, the Lord said in his heart, I will never again curse the ground because of man, for the intention of man's heart is evil from his youth. Neither will I ever again strike down every living creature as I have done.

This was before Moses and before "the giving of the law to Moses," yet we see the evil in men's hearts was so great that God destroys them. We see he holds them accountable for their sin.
We are all in agreement that we need the righteousness of Christ for our salvation. Only He could fulfill the law perfectly. We know our own righteousness is "filthy rags" before God. But then we are told by Peter and also in the Old Testament in many places to be holy and this is not only speaking of Christ's imputed righteousness, but a personal holiness and our active obedience to God's commandments.

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1 Peter 1 v.13 Therefore, preparing your minds for action, [1] and being sober-minded, set your hope fully on the grace that will be brought to you at the revelation of Jesus Christ. 14 As obedient children, do not be conformed to the passions of your former ignorance, 15 but as he who called you is holy, you also be holy in all your conduct, 16 since it is written, You shall be holy, for I am holy. 17 And if you call on him as Father who judges impartially according to each one's deeds, conduct yourselves with fear throughout the time of your exile, 18 knowing that you were ransomed from the futile ways inherited from your forefathers, not with perishable things such as silver or gold, 19 but with the precious blood of Christ, like that of a lamb without blemish or spot. 20 He was foreknown before the foundation of the world but was made manifest in the last times for your sake, 21 who through him are believers in God, who raised him from the dead and gave him glory, so that your faith and hope are in God.

22 Having purified your souls by your obedience to the truth for a sincere brotherly love, love one another earnestly from a pure heart, 23 since you have been born again, not of perishable seed but of imperishable, through the living and abiding word of God; 24 for

All flesh is like grass
and all its glory like the flower of grass.
The grass withers,
and the flower falls,
25 but the word of the Lord remains forever.

And this word is the good news that was preached to you.