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.

From whom does faith come?
What will be the fate of the one who curseth his father or his mother?
How was Moses taught during the days of his early childhood?
What message announces the judgment hour come?
What was given these martyrs?
When are the righteous to be recompensed?
Why, then, does God permit the chastening rod to fall?

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