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.

Who are called to repentance?
What must be crucified and eliminated from our lives if we would be holy?
How early were the Scriptures taught to Timothy?
What prophetic view of the judgment was given Daniel?
21. What shows that the new, or second, covenant and the Abrahamic covenant are virtually the same?
What special miracle is finally to be performed to deceive men, and fasten them in deception?
When John the Baptist was asked if he were Elijah, what did he say?

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