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.

For what purpose were the Scriptures written?
What prophecy was fulfilled in the slaughter of the children of Bethlehem?
13. After the accumulation of the sins of the year in this way, what service took place on the tenth day of the seventh month of each year?
What did Babylon give to the nations to drink?
Does God design that His great work of creating the heavens and the earth shall be remembered?
What saying will then be brought to pass?
What warlike scene is given under this trumpet?

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