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 to he accomplished at the close of the seventy weeks?
How will the decisions of the judgment be executed?
In His first recorded discourse, what did Christ say of the law?
What does the historian say of this legislation?
What prophecy had Paul upon which to base his statement?
To whose authority are the angels subject?
How should we sympathize with others in their sorrows?

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