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.

What was the Comforter to do when He came?
Besides the court, how many parts had this sanctuary?
In view of the judgment, what exhortation is given?
How does God regard those who walk in His law?
What similar charge was brought against the Apostle Paul?
How ancient is this doctrine of Christ's coming?
What universal chorus of praise will then be heard?

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