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.

Upon what basis has Christ taught us to ask forgiveness?
When Pilate heard that Christ was from Galilee, what did he do?
16. Could the offerings commanded by the ceremonial law satisfy or make perfect the conscience of the believer?
What is one thing for which God has given the Sabbath to he a sign?
22. What did Augustine, the father of this theocratical or church-and-state theory, teach concerning it?
What is Neander's conclusion regarding this theory?
What will God's faithful servants be doing at this time?

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