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 description of the Apostle Paul's experience is in harmony with this?
What danger attends the teaching of false doctrine?
How freely was the Holy Spirit bestowed upon Him?
How did Christ suggest that His disciples follow His example in teaching gospel truth?
Why was double manna given on the sixth day?
Against what deceptions did Christ then warn us?
What may be said of \"the sea and the waves roaring\"?

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