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.

With what comparison did He illustrate the subject?
What question did the disciples then ask?
By what is the knowledge of sin?
Where were the Ten Commandments placed?
Why was double manna given on the sixth day?
What do the works of God declare?
16. What striking testimony is borne by Neander, the noted church historian, regarding the origin of the Sunday Sabbath?

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