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.

How extensively did Christ make use of parables?
What portion of this period was to reach to Christ, the Messiah, or Anointed One?
What were sinners desiring pardon instructed to do?
How may we know that we love the children of God?
What power has claimed authority to change the law of God?
What question did the disciples ask Christ concerning His second coming?
What will the ransomed of the Lord then do?

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