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.

Why should husbands be considerate of their wives?
What is said of one who professes to know the Lord, but does not keep His commandments?
What did He teach concerning the stability of the law?
What does the prophet Isaiah, speaking for God through this Spirit of Christ, call the seventhday Sabbath?
When the state enacts religious laws, what is effected?
When did David say he would be satisfied?
What will be the first plague, and upon whom will it fall?

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