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 does God design that His Word shall be to us in this world of darkness, sin, and death?
How fully does the Lord pardon when one repents?
What cheering message has Christ sent to His people touching His resurrection?
To whom does vengeance belong?
How does the Lord, through the prophet Isaiah, indicate what is true Sabbath-keeping?
Of what family does Paul speak in Ephesians?
What is said of charity in the Scriptures?

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