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.

How do the children of God walk?
How intimate is His union with believers?
Upon whom is God's fury to be poured?
8. When did the Gentiles request that Paul should repeat the sermon he had preached at Antioch on the Sabbath?
How did the Apostle Peter say the message of the Lord's coming would be treated by some?
When is the resurrection of the righteous to take place?
What is the condition of one who lacks these graces?

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