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.

From what time has the devil been a murderer?
In what condition are all men?
What is necessary where there is a covenant?
6. What occurred at the time of the crucifixion which indicated that the typical system had been taken away by Christ?
Whom should we fear and dread?
What fate awaits those who turn a deaf ear to the poor?
What parable illustrates practical Christian help work?

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