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 the prophet Jeremiah declare Christ to be?
When did he say he saw the majesty of Christ, and heard the voice from heaven?
21. To what extent is the apostasy, or fall, of modern Babylon, the mother, and of her daughters, to be carried?
What promise is made to the willing and obedient?
What is the wages of sin?
What did the dragon do when cast to the earth?
Does Jesus sympathize with us in our afflictions?

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