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 Peter on the day of Pentecost tell his hearers to do?
What question must every unfaithful parent meet?
What motive will inspire all true parents to faithfulness in teaching their children?
What definite period is mentioned under this trumpet?
By what terms did Christ refer to the two resurrections?
Is it our duty always to give what is expected or asked?
17. Under what figure are the Gentile believers represented who have become a part of the true Israel of God?

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