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.

How came Jesus to live for a time in Egypt?
How should parents train their children?
When did the priest minister in the first apartment of the sanctuary?
1. What indicates that the messages of the judgment hour and the fall of Babylon are two parts of a threefold message?
That there might be no misunderstanding, what did Moses do?
What is to endure throughout all generations?
Over what do the people of God finally gain the victory?

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