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?
While drinking the wine, what gods did they honor?
At Corinth what did he do on the Sabbath days?
Do Protestant writers acknowledge the same?
What was the date of Constantine's famous Sunday law?
In religious things, to whom alone are we accountable?
How many foundations has this city?

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