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.

What assurance has the believer of his union with God?
In symbolic language, what is represented by winds?
What would obedience to God's commandments have ensured to ancient Israel?
Where were the Ten Commandments placed?
Why does the Lord call the Sabbath His day?
What courage and strength, therefore, should come to us even in the hour of affliction?
What was one of Christ's parting promises to His disciples?

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