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.

Who, therefore, did the speaking through these men?
How complete is the salvation obtained in Christ?
In His teaching, to what did Christ direct attention?
How diligently should parents teach children God's Word?
Just before the fall of Babylon, what did her king do?
Why were the ancient Sunday laws demanded?
What positive declaration does the apostle then make?

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