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 may be perceived through the things that are made?
When was Jesus born?
Why was the ceremonial law taken away?
How did God reprove their disobedience?
What text definitely brings the millennium to view?
What is Spiritualism defined to be?
Does God delight to afflict any?

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