How early was this sacrificial system known?

Answer

"By faith Abel offered unto God a more excellent sacrifice than Cain, by which he obtained witness that he
was righteous, God testifying of his gifts." Heb. 11: 4. See Gen. 4: 3-5; 8: 20.

With whom did sin originate?
With whom are the children of God joint heirs?
What reason did Solomon give for urging all to fear God and keep His commandments?
What did God say to Abraham concerning the Amorites?
What was decreed by the Council of Laodicea, in AD. 364?
To whom does the Sabbath belong?
Upon whom was the name Israel first bestowed?

Questions & Answers are from the book Bible Readings for the Home Circle