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 is God ready to do for all who seek forgiveness?
What command did the Lord later give to Abraham?
What warning is therefore given?
Does faith in God make void the law?
What reason is given in the commandment for keeping the Sabbath day holy?
5. What, in the parable, did God say to the rich man who thought to build larger barns in which to store his goods?
How does Satan deceive the people?

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