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According to the covenant that God instituted with Noah after the Flood; murder is a mandatory death offense. (Gen 9:5)

The death penalty for murder was included in the covenant that Yhvh's people agreed upon with God at Sinai as per Ex 21:12-14, Lev 24:17, Lev 24:21, and Num 35:31-34.

Q: So then, seeing as how capital punishment for murder is mandatory; then how was God able to let Cain walk without compromising His own integrity? Does God practice a double standard?

A: Murder is morally wrong, yes; and it is intrinsically a sin, yes; however; prior to the Flood, murder wasn't a transgression because God had not yet enacted any laws to that effect.

â€*. Rom 4:14 . .The Law brings about wrath, but where there is no law, neither is there violation.

â€*. Rom 5:13 . . Until the Law sin was in the world; but sin is not imputed when there is no law.

Case in point: Abraham married a half-sister. Sarah was his father's daughter, but not his mother's (Gen 20:12). According to the covenant that Yhvh's people agreed upon with God at Sinai, it is a breach of the covenant to sleep with someone that close.

"The nakedness of your sister-- your father's daughter or your mother's, whether born into the household or outside --do not uncover their nakedness." (Lev 18:9)

But Abraham was exempt from that law because God didn't introduce it till several centuries after Abraham.

â€*. Gal 3:17 . .What I am saying is this: the Law, which came four hundred and thirty years later, does not invalidate a covenant previously ratified by God, so as to nullify the promise.

In other words: the Law as per the covenant that Yhvh's people agreed upon with God as per as per Deut 29:9-15 isn't retroactive.

Modern Judaism insists that Deut 29:14-15 retroactively binds Abraham to the covenant. Well; not only is that kind thinking a stretch of the imagination; but it's not even sensible because any and all breaches of the covenant incur curses.

"Cursed is the one who lies with his sister, the daughter of his father or the daughter of his mother." (Deut 27:22)

"Cursed is he who does not confirm the words of this law by doing them." (Deut 27:26)

If God were to level curses at Abraham for breaching the covenant; then God would be quite obligated to level curses at Himself.

"I will curse him who curses you" (Gen 12:3)

The Jews' occupation of the land of Israel has always been conditional upon their compliance with the covenant; but their ownership of the land has always been conditional upon the promises that God made to Abraham prior to the covenant's institution. That way there is no possible chance of Abraham's posterity ever losing the deed to that land no matter how many times they breach the covenant. They might get evicted from their homeland from time to time; but it will always remain theirs due to Abraham's immunity to the covenant's curses.