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.

For what spiritual gift did the Apostle Paul pray?
How then do all become children of God?
What accompanies repentance?
In symbolic prophecy what length of time is represented by a day?
What did this nearness of the time of restoration from captivity lead Daniel to do?
What is the object of the International Reform Bureau?
What was the result of this message?

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