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 gives victory in our conflicts with the world?
What does the prophet Jeremiah declare Christ to be?
With what words did God admonish Cain?
What did John say was to be the end of this beast?
How does Paul say the saints will he raised?
How may grace and peace be multiplied in believers?
Why did Christ say the meek are blessed?

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