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 what language did Isaiah foretell Christ's birth?
Instead of consenting to His release, what did Christ's accusers now demand?
11. How is the closing work of the gospel under the outpouring of the Spirit described by the Revelator?
How is the remnant church described?
How much honor is due to Christ?
How does David speak of Christ's coming?
How many of these beings did John see around the throne?

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