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.

From whom does faith come?
Where was Daniel at this time?
With what is God's seal connected?
Where had the prophet said Christ should he born?
In what language had some of the Old Testament prophets already foretold these signs?
After whose body will these resurrected ones be fashioned?
Why does Christ desire this growth in His followers?

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