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.

By whom were the heaven and the earth created?
What relation does the earthly sanctuary sustain to the heavenly?
That there might be no misunderstanding, what did Moses do?
After the crucifixion, what day was kept by the women who followed Jesus?
For what will the heathen he assembled in Palestine?
What becomes of man's thoughts at death?
Why is it better to go to the house of mourning than to the house of feasting?

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