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's attitude toward the sinner?
For what purpose was Christ manifested?
What remarkable experience attended the baptism of Jesus?
How is the righteousness thus obtained described?
Why did Adam call his wife's name Eve?
To whom has execution of judgment been committed?
For what purpose was the earth created?

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