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.

Was Satan created sinful?
In what prophecy did Christ recognize Daniel as a prophet?
What reply did Moses make to the rulers?
What does the historian say of this legislation?
How will this great event affect the world?
For what purpose did Christ say God had anointed Him?
How many foundations has this city?

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