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.

How, according to prophecy, was Christ to conduct Himself when on trial?
In what other statement is this same truth expressed?
BY whom was the Ten Commandment law proclaimed?
What is said concerning the captivity and downfall of the Papacy?
In what language had some of the Old Testament prophets already foretold these signs?
Why did God give His only begotten Son to the world?
When she persisted in her request, and fell down to worship Him, what did He say?

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