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, according to prophecy, was Christ to conduct Himself when on trial?
When man first transgressed, what was done to prevent him from living for ever in sin?
In what psalm was the resurrection of Christ foretold?
What song of triumph follows the overthrow of Babylon?
Of what sin were the Amorites specially guilty?
What are the \"better promises\" upon which the new covenant was established?
What was to he inflicted upon one of the heads of this beast?

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