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.

With whom are the children of God joint heirs?
What should we say for such a Saviour?
In view of the judgment, what exhortation is given?
Why did God destroy the antediluvian world?
20. When and by what church council was the observance of the seventh day forbidden, and Sunday observance enjoined ?
What has always been the result of religious legislation or a union of church a state ?
Why does God comfort us in tribulation?

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