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.

When was Jesus born?
What is the gift of God?
What followed immediately after the gaoler and his family had accepted Christ as their Saviour?
BY whom was the Ten Commandment law proclaimed?
In what words did He foretell its destruction?
How ancient is this doctrine of Christ's coming?
What reward awaits the true child of God?

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