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.

Upon what evidence did Jesus base His Messiahship?
What is said of God's faithfulness in keeping His promises ?
Was it possible for Christ to be holden of death?
What kind of labor is to be done through the week?
Are they interested in the conversion of men?
How may one grow in grace?
What is promised to the willing and obedient?

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