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 is God ready to do for all who seek forgiveness?
What indwelling Power keeps such from sinning?
Does the New Testament teach the same duty?
By whose Spirit did the prophets write?
What Christian grace are we exhorted to exercise in our expectant longing for this event?
By what means were the apostles delivered from prison?
10. As we near the closing scenes of human probation, why may we expect an increase in demoniacal manifestations?

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