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.

For what spiritual enlightenment should everyone pray?
What is the wages of sin?
3. Through what experience was the church to pass, and what was to develop in the church, before Christ's second coming?
6. In His reply, how did Christ indicate that neither the end of the world nor of the Jewish nation was immediately at hand ?
Does He afflict to leave the one chastened in despair?
To whom did Jesus first send the twelve disciples?
How much of the land of Canaan did Abraham own in his lifetime?

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