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.

To what place did Christ carry these sins?
Why did Adam call his wife's name Eve?
17. What assurance was given by the angel that these prophecies would he understood in the last days?
How had they done this?
Is it the duty of gospel ministers to execute vengeance?
What, aside from sin, causes more sorrow than all else?
What did Christ say concerning secret prayer?

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