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 is God declared to be?
Why did Israel fail to attain unto righteousness?
What work did Daniel see finally assigned to the saints?
Who did He say would be called great in the kingdom?
Of what besides a knowledge of God as Creator, is the Sabbath a sign?
Concerning what have we been definitely informed?
To whom has God given the earth?

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