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 did Jesus say of the one who loves Him?
What is the great secret of a happy home?
In what instruction did He emphasize the importance of keeping the law?
What was shown upon the opening of the first seal?
How will this great event affect the world?
8. After the fall of Western Rome, what power in the East arose to harass and overrun the Roman world, East and West?
Where do all go at death?

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