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 application did Jesus make of this prophecy?
By what commands has God guarded the marriage relation?
When Christ came to this earth, what was His attitude toward God's will, or law?
What unites all believers under the new covenant?
What was the date of Constantine's famous Sunday law?
Through whom is this first dominion to be restored?
Of what material is the wall constructed?

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