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 lesson did Christ design to teach in healing the man sick of the palsy?
Why should children obey their parents?
What has ever been the theme of God's prophets?
What was offered in this sanctuary?
What, according to the prophecy of Daniel, was to characterize the time of the end?
What will be the third plague?
What did Christ say would be the experience of His people in this world?

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