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.

Of what kind of doctrines should we beware?
Why did Adam call his wife's name Eve?
Who is this dragon?
In what were the laws or commandments respecting sacrifices and burnt offerings written?
What is said of the character of these scaled ones?
What does the Papacy set forth as the mark, or sign, of its power and authority?
As He was about to leave the temple, what did He say?

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