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 was Christ made, to release men from sin?
What did Christ's words at Jacob's well lead the woman of Samaria to ask?
How futile was all this?
Under the old covenant, what did the people promise?
How did Christ's death on the cross affect the whole sacrificial system?
What does He say of the teachings of enchanters and sorcerers?
17. Under what figure are the Gentile believers represented who have become a part of the true Israel of God?

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