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.

Where was the Messiah to he born?
To whom does the \"seed\" in these promises refer?
17. What prophetic period, therefore, extends to the deliverance of God's people from the captivity in modern Babylon, and the restoration to them of the mediation of Christ?
What other reason is given for keeping the Sabbath?
What endearing title is given the sixth church?
How long will there be poor in the world?
How perfect will be their knowledge of God?

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