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 is this change from death to life called?
What did Christ's words at Jacob's well lead the woman of Samaria to ask?
What is one way in which a child may dishonor his parents?
On what day was John in the Spirit?
What warning has Christ given concerning false views of the manner of His coming?
What promise is made to those who look for Him?
With what were many possessed in Christ's time?

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