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.

How will the curse of the confusion of tongues be brought to an end?
In what condition are all before they are quickened with Christ?
By what means is all Scripture given?
What admonition is therefore given?
At the conclusion of Daniel's prayer, what assurance did Gabriel give him?
What does He say He will bring with Him when He comes?
How did Christ speak of the gathering of the Gentiles?

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