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 did Jesus declare God's commandments to be?
What were some of the results of the preaching of the gospel under the outpouring of the Spirit?
To what did the ordinances pertain that were thus abolished?
On which day was a double portion of manna gathered?
After the crucifixion, what day was kept by the women who followed Jesus?
How ancient is this doctrine of Christ's coming?
7. What description does Paul give of the sufferings endured by some of God's people in former ages?

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