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.

How perfect is the unity into which believers are brought by being baptized into Christ?
When God brought His people out of Egypt, how did He republish His law?
What did Constantine's law require?
Then by whom was the Sabbath made?
What was one principal object in calling this council?
What class only have part in the first resurrection?
How may the- lack of wisdom be supplied?

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