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 is the true basis of the brotherhood of man?
By what means did Herod seek to destroy Christ?
After He had prayed this remarkable prayer three times, what occurred?
What promise is made to the willing and obedient?
By what are we to try them?
In His transfiguration, how did Christ appear?
What does Paul say God has prepared for His people?

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