The issue is what circumcision, and holiness was causing within the different sects of Judaism. SEEKING TO BE JUSTIFIED BY THE DEEDS OF THE LAW. Cain's issue was that by doing something he wanted his work to be accepted. When it was rejected he had an issue, that issue was with his brother
1 John 3:12. Cain is corrected by God, and told how he could get it right with God so his sacrifice would be accepted. In Rabbinical Judaism it is all of the mitzvah, that is the focus, not God. going about to establish their own righteousness
Romans 10:3. We aren't saved by works, we are judged by our works. Therefore if we love God, it isn't grievous to keep His commandments
1 John 5:3. Therefore remember the sabbath day, to keep it holy. Six days you shall labor, and do all your work, but the seventh day is a sabbath to the LORD your God. On it you shall not do any work, you, or your son, or your daughter, your male servant, or your female servant, or your livestock, or the sojourner who is within your gates. For in six days the LORD made heaven and earth, the sea, and all that is in them, and rested on the seventh day. Therefore the LORD blessed the sabbath day and made it holy. So, therefore this is a moral precept? Am I right?