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 does God design that His Word shall be to us in this world of darkness, sin, and death?
To whom will the gates of the heavenly city finally be opened?
What promise is thus fulfilled?
Does the New Testament teach the same duty?
Where do all go at death?
Are angels of a higher order of beings than man?
How may the- lack of wisdom be supplied?

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