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?
How did Noah show his faith in this message?
How did His questions and answers impress those who heard Him?
By whose Spirit did the prophets write?
10. What definite period of time was allotted to this great persecution of God's people under papal Rome?
What did David say with reference to his being afflicted?
Whose names are on the twelve gates of the city?

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