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 was the fourth beast declared to be?
4. What explanation did Moses give the rulers of Israel concerning the withholding of the manna on the seventh day in the wilderness of Sin, before they reached Sinai?
Why did God make His promise to the seed of Abraham?
Whom should we fear and dread?
How are the people described who are developed by the threefold message here referred to?
What is promised those who add grace to grace?
To whom has God given the earth?

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