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 chapter in the Bible is devoted to faith?
What will be the burden of the closing gospel message?
When the he goat \"was strong,\" what occurred?
Why do the inhabitants of heaven worship God?
What is said of one who professes to know the Lord, but does not keep His commandments?
What power is there in the blood of this covenant?
What did Christ say would he the result if the days of persecution were not shortened?

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