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 prophecy of Isaiah was fulfilled at Christ's birth?
What was the result of Christ's working miracles at His first passover?
21. Although Pilate had declared his belief in Christ's innocence, yet what cruel punishment did he inflict upon Him?
What closed this terrible scene?
How does James say the rich have lived?
Is Christ ever called an angel?
For what purpose was man made?

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