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 assurance is given concerning the unfailing power of the Creator?
When men appreciate God's love, what will they do?
In whom has God made us accepted?
What is the very life of the Spirit?
How long was Jerusalem to be trodden down of the Gentiles?
How perfect does Christ tell us to be?
To what is the life of the redeemed compared?

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