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.

18. When asked by the rich young man the conditions of eternal life, to what did Jesus direct his attention?
What did those do who were baptized of John?
What will be the standard in the judgment?
What is predicted of the moral condition of the world in the last days?
What becomes of the living wicked when Christ comes?
What description is given of Gabriel in Daniel?
What does Christ promise overcomers?

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