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 was God's design in thus giving the Scriptures?
What did the devout Simeon say when he saw the child Jesus?
What testimony did Nicodemus bear concerning Him?
To whom has execution of judgment been committed?
What day is especially indicated as the day to prepare for the Sabbath?
How long was Jerusalem to be trodden down of the Gentiles?
Who will be permitted to enter it?

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