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.

Whom did Jesus pronounce blessed?
How was Christ to be received by His own people?
Who is brought before the Father at this time?
By what method of reasoning did Christ justify acts of mercy on the Sabbath day?
At His ascension, how did the angels say Christ would come again?
Did angels exist before the death of any of the human family?
For what purpose did God give His Son to the world?

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