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 encouraging statement follows concerning the supply of power to the faint?
Upon how many of the human race did death pass as the result of Adam's transgression?
Of what was Abraham's obedience the fruit?
What did God say to Abraham concerning his wife, Sarah?
What response did the people make to this proposition?
When did Christ say the good would he recompensed?
What name is given to the third state of the church?

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