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 whom was Belshazzar's kingdom given?
What, in prophecy, is symbolized by waters?
How does God regard those who walk in His law?
What was Paul's manner respecting the Sabbath?
How is this great and dreadful day described in this same prophecy?
How was Christ strengthened after His forty days' fast and temptation in the wilderness?
When expiring on the cross, what did Christ say?

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