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.

When proclaiming His name to Moses, how did the Lord define His character?
Upon what ground does God's work for sinners rest?
What witness does the true believer in Christ have that he is accepted of God?
What did Jesus declare God's commandments to be?
By what means is all Scripture given?
6. What influence do the Bible and history show working in the church immediately after apostolic days?
7. What, according to Matthew's account, did Christ say were to he the signs in the sun, moon, and stars?

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