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 great. is Gods love for the world?
How early does Paul say Timothy was instructed?
How was the little horn to treat God's people?
What did He teach concerning the stability of the law?
When was the papal head of the first beast of Revelation 13 wounded?
What encouragement is held out concerning the branches which have been broken off?
What does Christ give His followers?

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