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 completely does God wish to separate sin from us?
In what promise was a Saviour from sin first revealed?
14. What instruction did Abraham give his servant Eliezer when sending him to select a wife for his son Isaac?
What, according to the prophecy of Daniel, was to characterize the time of the end?
What accompanies the earthquake?
What did Christ say concerning secret prayer?
What is to become of our earth in the day of the Lord?

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