Bible Question: What was the First Sin?

Christian/New Testament concepts of sin, Satan, redemption, and the Redeemer seem far more matured than Jewish/Old Testament concepts. The concept of covetousness (for example) is repeatedly spelled out as sin.I realize that word "mature" evokes varying meanings and is a gross oversimplification. (Thus, my speculation is meager and not dogmatic)By the time of Daniel, Satan seems as a ruler over kings in metaphysical realms (i.e., withstanding the King of Persia).That the OT has many gaps and mysteries in this matter we'd all probably agree. (So does the NT) Comparing OT and NT scriptures becomes fruitful in filling in the gaps, methinks.Today, many of us have quite an astute concept of Satan, demons, sin, selfishness, pride, and the evil that lurks within and without.Redemption from so many subtle yet overwhelming evil forces (via the Lamb-Redeemer's mechanism) is my desperate and dogmatic solution to my own pain of sin and the devil.

"Whose concept are you referring to here? It doesn't get any clearer than "thou shalt not covet...." in the Ten Commandments."Regarding people from your country and mine: Judgemental Laws and legal systems on various levels should answer your question better than I could begin to.As for NT concepts of covetousness, sin, and the laws of judgement (and redemption) you might pick up and read the first chapter after Acts, Romans 1

OK, I see your (good) point now:Essentially it is true:Covetousness as a commandment is clearer defined in the OT.Notwithstanding, the hypocrits, pharasees, saduccees, etc. of Jesus' day did not preach against covetousness, lust, etc. to any near extent that Christ did. They were "clean on the outside" only. Well you and I may excuse ourselves as being clean on the outside as did the OT doctors of Jesus' day.(Albeit you may still rebuke me that the OT states the same and I won't disagree)