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.

How is Christ's resurrection foretold in the Psalms?
What threefold union is thus established?
How faithfully should parents teach their children the Word of God?
For what did Christ reprove the Pharisees?
What is declared to be the chief advantage possessed by the Jews?
How did death enter the world?
19. How will Christ's coming overtake those evil servants who say in their hearts, \"My Lord delays His coming\"?

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