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.

Through whom did God create all things?
What was Christ made, to release men from sin?
What was the special mission of John the Baptist?
12. What universal boycott is to be employed, in an attempt to compel all to receive the mark of the beast?
What awaits those who despise the means of grace?
With what words did God admonish Cain?
How had Moses spoken of another and greater dispersion?

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