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 prophetic declaration foretold this truth?
On what day did Paul and his companions preach to the devout women at Phillippi?
Why is a national Sunday law demanded?
How are the people described who are developed by the threefold message here referred to?
17. What great contrast will be seen between the present body and the one to be put on in the resurrection?
How long will there be poor in the world?
What gives us the victory in our conflict with the world?

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