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.

To whom does the \"seed\" in these promises refer?
In making this home, what besides man was needed?
What is the beginning of wisdom?
What specifications of \"the man of sin\" are thus fully met?
How does Joel describe the day of the Lord?
Whom does the Lord chasten?
Why did Christ say the meek are blessed?

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