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 home did God make for man in the beginning?
What other prediction asserts the same great truth?
With what promise do the Old Testament Scriptures close?
5. Does the second, third, fifth, sixth, seventh, eighth, ninth, or tenth commandment indicate the author of the Decalogue?
What did Christ tell the rich young man to do?
In how many things may we ask help from God?
If an answer does not come at once, what should we do?

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