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 solemn charge was given him concerning his public work?
To another whose sight He had restored, what did Christ say?
What cheering message has Christ sent to His people touching His resurrection?
Why should wives he in subjection to their husbands?
What test case arose in the time of the apostles over this question?
What kind of worship does the Savior call that which is not according to God's commandments?
What promises are made to those who consider the poor?

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