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.

13. What three general divisions did Jesus recognize as including all the writings of the Old Testament?
And how should husbands regard their wives?
In what other prophecies is this same period mentioned?
For what purpose did the law enter?
While God is merciful, does this clear the guilty?
What was given these martyrs?
How many foundations has this city?

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