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?
How many are affected by Adam's transgression ?
What importance is attached to Christ's resurrection?
Through Christ, what has been opened to the house of David?
For what work was this baptism to prepare them?
Who will thus he judged by the saints?
What is promised those who trust in Jesus?

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