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.

What home did God make for man in the beginning?
Through what was the original creation wrought?
Of what kind of doctrines should we beware?
What was the result of this great miracle?
14. How was the sanctuary itself to be cleansed, and how were the sins of the people to be finally disposed of?
How did Christ's death on the cross affect the whole sacrificial system?
21. What scripture shows that Satan is to work with special power and deceptive wonders just before Christ's second coming?

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