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 encouragement is held out as an aid in attaining this experience?
From what time does David say he himself was taught?
22. At the death of Christ, what miraculous occurrence signified that the priestly work and services of the earthly sanctuary were finished?
How early was this tendency manifested?
How does Joel describe the day of the Lord?
What did Job say in the midst of his afflictions?
4. And when the new heavens and the new earth have appeared, and the holy city, New Jerusalem, then he made?

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