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 perfect does Christ tell His followers to be?
What kind of labor is to be done through the week?
When was there a remarkable display of falling stars?
What does the Apostle Paul say concerning this?
How was Peter delivered later?
When praying what must we do in order to be forgiven?
Is it our duty always to give what is expected or asked?

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