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 did the father show his joy at his son's return?
How perfect is the unity into which believers are brought by being baptized into Christ?
What tender, filial regard did Christ manifest for His mother in the hour of His death?
How many are included in the \"all\" who have sinned?
How does this association regard the Catholic Church on this point?
How are the people described who are developed by the threefold message here referred to?
What reason did Paul give for glorying in tribulations?

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