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.

For what purpose did Christ come into the world?
In what way was Jonah a type of Christ?
21. To what extent is the apostasy, or fall, of modern Babylon, the mother, and of her daughters, to be carried?
In what were the laws or commandments respecting sacrifices and burnt offerings written?
What is necessary where there is a covenant?
What is the one great feature by which the true God is distinguished from all false gods?
By what are we to try them?

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