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 is the true poetry of life to be found?
Of whom did Christ say the Scriptures testify?
Whom did Christ say the Holy Spirit would glorify?
How are these gifts elsewhere spoken of?
How did this change in observance of days come about, suddenly or gradually?
When was the union of church and state formed from which the Papacy grew?
Who is the seed to whom this promise was made?

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