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 are those who suffer exhorted to commit their souls?
How definite should we be in confessing our sins?
What power was represented by the ram having two horns?
How many lawgivers are there?
What is first commanded in the Sabbath commandment?
What prophecy had Paul upon which to base his statement?
On opening the fifth seal, what was seen under the altar?

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