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.

To what extent has Christ suffered for sinners?
How is the love of God supplied to the believer?
What relationship to God is established by faith?
To whom does God reveal the secrets of the future?
What final disposition was made of the sins of the people?
Why was the ceremonial law taken away?
To whom is salvation promised at Christ's appearing?

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