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.
 


Why cannot the natural man receive the things of the Spirit?
How was the earth itself affected by Adam's sin ?
What does the imputed righteousness of Christ enable God to do, and still be just?
What is the last book of the Bible called?
What assurance has God given of the judgment?
What may be said of \"the sea and the waves roaring\"?
How had Moses spoken of another and greater dispersion?

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