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.

Does proper correction evidence a want of parental love?
What relation does a justified person sustain to the law?
Who does Christ say need a physician?
21. What shows that the new, or second, covenant and the Abrahamic covenant are virtually the same?
How enduring did He say the law is?
When is the resurrection of the righteous to take place?
What seasons of worship will be observed in the new earth?

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