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.

In view of the curse upon this creation, what has God promised?
What are some of the attributes of God?
15. When God sent the Ninevites a warning message, how did they show their repentance, and what was the result?
What takes place when one is converted to Christ?
How closely are righteousness and life thus united?
With what was He filled?
What encouragement does Jesus give us to meet cheerfully the troubles and trials of life?

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