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 promise is made to those who confess their sins?
What did He say to the two blind men as He healed them ?
What is the Lord able to do regarding the future?
What response did the people make to this proposition?
When and by whom was the Sabbath made?
Who alone knows the exact day of Christ's coming?
What question does Job ask and answer?

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