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 did this promised seed refer?
What did Hezekiah say God had done with his sins?
At what cost did even He learn the lesson of obedience?
How diligently should parents teach children God's Word?
What is said of those who love God's law?
Of what did Christ say the Son of man is Lord?
For what purpose was man made?

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