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.

What other experience is associated with conversion?
What danger attends the teaching of false doctrine?
22. How many of the commandments is it necessary to break in order to become a transgressor of the law?
When had God said this?
What kind of worship does the Savior call that which is not according to God's commandments?
Why was woe at this same time proclaimed to the world?
At this time what event is imminent?

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