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 does the Spirit witness to our acceptance with God?
What encouragement is held out as an aid in attaining this experience?
Is there danger of delaying correction too long?
What was indicated by the mixture of clay and iron in the feet and toes of the image?
What is the next event mentioned in the prophecy?
How is their watch-care over God's people expressed?
How readily will their wants be supplied?

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