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.

To whom are sinners brought by conversion?
Into what experience are those baptized who are baptized into Christ?
What similar instruction was given to Titus?
Upon whom is God's fury to be poured?
1. What indicates that the messages of the judgment hour and the fall of Babylon are two parts of a threefold message?
How early was this tendency manifested?
How may grace and peace be multiplied in believers?

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