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 blessed assurance is given all believers in Christ?
In what were the laws or commandments respecting sacrifices and burnt offerings written?
What besides creation were Israel to remember when they kept the Sabbath?
In what words did He foretell its destruction?
Did the early disciples think that death would he the second coming of Christ?
What is the last enemy to be destroyed?
In what scripture are Christians recognized as Israel?

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