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 question did -Christ's wonderful teaching call forth?
What was to he the character of the little horn?
How is the true God distinguished from all false gods?
How is their watch-care over God's people expressed?
How does Satan deceive the people?
How important is the trial of our faith?
What will he receive who endures temptation?

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