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.

How is Christ's resurrection foretold in the Psalms?
What question did the disciples then ask?
What announcement immediately follows the judgment-hour message of Rev. 14: 6,7?
13. In this same prophecy, how is the Church of Rome, the Papacy, designated as the antitype of ancient Babylon?
By whom were the worlds made?
How is this great and dreadful day described in this same prophecy?
What did John see concerning this city?

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