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 great blessing did Christ confer upon His disciples after His resurrection?
After receiving a knowledge of the truth, what must one do in order to be sanctified by it?
After Pentecost, how was the gospel preached?
In symbolic prophecy what length of time is represented by a day?
1. How did Christ feel concerning Jerusalem, as He was about to make His final visit to the city before His crucifixion?
As soon as the wicked are raised, what does Satan at once proceed to do?
Whom will they be like?

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