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 did God say to Abraham concerning his wife, Sarah?
By what other terms are these covenants designated?
10. What definite period of time was allotted to this great persecution of God's people under papal Rome?
How was the flood stayed, and Satan's -design defeated?
When did Christ say the good would he recompensed?
19. Just before the pouring out of the plagues, what call does God send to His people still in Babylon?
What does Paul say of their number?

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