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.

What other experience is associated with conversion?
What will be the fate of those who do not obey the gospel of Christ?
After creating Adam and Eve, what did God say to them?
To whom did God commit the care and early training of His only begotten Son?
What were these stones to commemorate?
Will this he a time of judgment?
What is promised those who add grace to grace?

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