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.

By what did Peter, on the day of Pentecost, say that Christ had been approved by God?
To what indignities did Herod subject the Saviour?
After His resurrection, what effect had this prediction upon His disciples?
How does Paul speak of the resurrection of Christ?
What pitiful appeal did He make to the impenitent city?
7. What did He say of the wars, famines, pestilences, and earthquakes which were to precede these events?
Of what will the saints speak?

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