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.

Where was the Messiah to he born?
What other experience is associated with conversion?
Does the Bible recognize what may be called \"present truth\"?
What did Daniel ask of one of the heavenly attendants who stood by him in his dream?
What reason is assigned for the fall of Babylon?
When Christ thus ministers the law in the heart, what does it become?
What shows that God imputed sin to Cain?

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