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.

Can man free himself from the dominion of sin?
What was indicated by the mixture of clay and iron in the feet and toes of the image?
How enduring are His commandments?
Have we reached the time when there is \"distress of nations, with perplexity\"?
When, according to prophecy, were men to amass great wealth?
What will be the third plague?
What is implied in a knowledge of God and Jesus Christ?

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