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.

31. What scripture shows that the righteousness which is received by grace through faith must not be made an excuse for continuing in sin?
After bringing Him to the place of crucifixion, what drink was offered Christ to stupefy Him?
What comforting promise has God made concerning the sleeping saints?
Why, under these plagues, does the Lord give men blood to drink?
What promise is made to those that mourn?
What is the bond of perfection?
With what are the twelve foundations adorned?

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