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 deliverance was thus made possible?
What question was asked in the vision of Daniel 8?
Through whom did God create the world?
By whom were all things created?
Why was woe at this same time proclaimed to the world?
What has the Pope commanded all Catholics to do?
What assurance has God given to believers?

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