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.

In what act especially has Gods love been manifest?
What two facts testify to the union of divinity and humanity in Christ?
What relation does the earthly sanctuary sustain to the heavenly?
Just before the fall of Babylon, what did her king do?
How did Jesus answer them?
What did the Apostle Paul say the \"man of sin\" would do?
Why was the gospel to be preached to the Gentiles?

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