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 the devil's relationship to lying?
Why did God reprove Eli?
What assurance was given to Daniel concerning the period of time mentioned in verse 14?
How are those described who heed this warning?
Why was the ceremonial law taken away?
What becomes of the living wicked when Christ comes?
How long is Satan to be imprisoned on this earth?

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