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 whose image was man created?
What assurance has the believer of his union with God?
How does the death of Christ bear testimony to this?
What words of Peter seem to indicate another outpouring of the Spirit?
By what is Grecia, the kingdom succeeding Medo-Persia, represented in the image?
After accepting Christ, what are we to do?
To whom must one belong in order to be Abraham's seed?

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