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 rendered it possible for God to treat sinners thus?
In what song of praise did a host of angels join?
Who is brought before the Father at this time?
What did Joseph, in Egypt, say when tempted to sin?
What may be known with equal certainty when these signs have been seen?
What will he one of the last great signs performed by this means, to fasten men in deception?
How readily will their wants be supplied?

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