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 does the \"seed\" in these promises refer?
Into what experience are those baptized who are baptized into Christ?
What change did Daniel see take place in these horns?
What will be the standard in the judgment?
Who is it that blinds men to the gospel of Christ?
What did Christ tell the rich young man to do?
What has Christ promised the overcomer?

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