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 is this change from death to life called?
Whose presence does the Holy Spirit bring to the believers?
What call was made to come out of Babylon?
Where did Moses command the Levites to put the book of the law which he had written?
What is Neander's conclusion regarding this theory?
13. The righteous dead are raised at Christ's second coming. When will the rest of the dead, the wicked, be raised?
How extensive will be the reign of Christ?

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