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 assurance is given concerning the unfailing power of the Creator?
In view of God's great love to us, what ought we to do?
By what are all men proved guilty?
How universal is the worship of this power to become?
Notwithstanding the lamb like appearance of this power, what is it ultimately to do?
Do they take any part in earthly things?
If one lacks wisdom, what is he told to do?

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