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 does God's character preclude Him from doing?
By what name is Christ appropriately called?
How may one know that this does not refer to the earthly sanctuary ?
With whose blood was the new covenant dedicated?
What scriptures show that Christ's coming will be a time of reward?
For what purpose was the Revelation given?
What famine will come at this time upon those who have rejected God's messages of mercy?

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