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.

To what extent has God magnified His Word?
Why do the inhabitants of heaven worship God?
What is the meaning of the word \"Sabbath\"?
How are the character, work, period of supremacy, and great power of the beast described?
In what was shown the first tangible evidence of this \"falling away\" from the truth of God?
What did John the Baptist say to the Pharisees and Sadducees who came to his baptism?
For what purpose was man made?

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