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 was the earth itself affected by Adam's sin ?
24. In what prayer for those who crucified Him did Christ manifest the true spirit of the gospel-love for sinner?
Were any efforts to he made to reunite the divided empire of Rome?
Who did He say would be called great in the kingdom?
What does it mean when used with reference to law?
By what figure does the Bible represent death?
If one lacks wisdom, what is he told to do?

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