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 inseparable from the experience of justification by faith?
To whom was Belshazzar's kingdom given?
Is there any evidence that such an image will be made?
What was already at work in the church in Paul's day?
How does David speak of Christ's coming?
What is God called in the Scriptures?
How does God regard one who abandons his faith?

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