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 God's attitude toward the sinner?
17. What prophetic period, therefore, extends to the deliverance of God's people from the captivity in modern Babylon, and the restoration to them of the mediation of Christ?
Of what did Christ say the Son of man is Lord?
Against what three things does the third angel of Revelation 14 warn men?
What was the color of the symbol under the third seal?
How does God regard the afflicted?
When the Jews rejected Paul's preaching of the gospel, what did he and Barnabas say?

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