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 blessed experience follows upon the acceptance of Christ as our righteousness?
How does the Revelator describe this satanic desire to destroy Christ?
Was the judgment still future in Paul's day?
How, then, did the Lord prove the people (verse 4) whether they would keep His law, or not?
What did the Apostle Paul say the \"man of sin\" would do?
How is the church at the first advent described?
What peaceful condition will reign throughout the earth then?

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