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 promise is made to those who repent and are baptized ?
How has Christ made it possible for righteousness to be imputed to the believer?
After He had prayed this remarkable prayer three times, what occurred?
What did the Apostle Paul say the \"man of sin\" would do?
When did Paul expect to receive his crown?
Under what condition does the Lord not hear prayer?
How perfect will be their knowledge of God?

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