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 encouragement is held out as an aid in attaining this experience?
How should the wife relate herself to her husband?
What is said of those who love God's law?
Can there be sin where there is no law?
Until what time did the ceremonial law impose the service performed in the worldly sanctuary?
Why was the ceremonial law taken away?
What is one evidence that one has a knowledge of God?

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