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 does God design that His Word shall be to us in this world of darkness, sin, and death?
What example of obedience has Christ set for us?
What admission did they secure from Him as the basis of condemning Him?
Upon whom is God's fury to be poured?
What was the first beast like?
Just before the fall of Babylon, what did her king do?
Why will many not be prepared for this event?

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