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.

16. How did Christ reprove those who, though familiar with the letter of the Scriptures, failed to understand them?
With whom was Christ crucified?
What statement testifies to Abraham's faith in God ?
What importance is attached to Christ's resurrection?
Through what was Christ made a complete and perfect Saviour?
At Corinth what did he do on the Sabbath days?
By what title does the Psalmist address God?

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