Re: “The man shall surely be put to death; all the congregation shall stone him"
Roberth
You believe David was not under the OC or the jurisdiction of the law, for he was looking to the4 coming Christ. and that is why he escaped death for breaking the law, whereas the man who picked up wood on the Sabbath died. The problem is why would only certain people under the Old Covenant be privy to such knowledge and not others? It wouldn't be the same covenant for all would it?
I think my speculation would be much nearer the mark than your theology, theology that I have never heard from anyone else. So either you know far more than virtually every minister in the pulpit or you are wrong.
If a person loved God in their heart there was always forgiveness, under the old covenant. David was a man after God's own heart, he loved God and delighted in keeping his laws. Therefore God forgave his sin. If someone under the old covenant didn't love God, and broke three of the ten commandments in a row. Thou shalt not covet, commit adultery, kill, do you think God would have forgiven them? Therefore it is reasonable to assume God knew the man who picked wood on the Sabbath didn't love him, or care about his laws. Speculation yes, but not theology that I have never heard of in forty years of going to church, or heard on the internet either incidentally.
I think my view therefore is much more likely to be the true one