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.

How definite should we be in confessing our sins?
What effect did this dream have upon Daniel?
What, in prophecy, is symbolized by waters?
In what condition are all men?
18. Answering the question as to what would be the sign of His coming and the end of the world, what did Christ say?
Is it our duty always to give what is expected or asked?
What determines whether one is a child of Abraham?

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