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 is Christ to one renewed after God's image?
What will He then do for each one?
Where were the Ten Commandments placed?
10. What does the Psalmist say was the reason why God brought His people out of Egypt, and placed them in Canaan?
Where had the prophet said Christ should he born?
What answer did Elijah make?
How completely will the pains and sorrows of the former world pass away?

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