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 are parents instructed to bring up their children?
By what was the third universal empire symbolized?
While drinking the wine, what gods did they honor?
What question does Job ask and answer?
What protection has God promised His people during the seven last plagues?
What will he receive who endures temptation?
What promises are made by Christ to the overcomer?

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