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 the Apostle Peter associate with baptism in his instruction on the day of Pentecost?
By what is this cleansing from sin and fitting for God's service accomplished?
What effect did the preaching of the Apostle Paul have upon the Gentiles?
What commandment guards the honor of the mother?
Can there be sin where there is no law?
With what were many possessed in Christ's time?
What was shown the Apostle John in vision?

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