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.

By what name are the sacred writings of the Bible commonly known?
What change is wrought by beholding Jesus?
In all we do, whose glory should we have in view?
How many were saved in the ark?
For what are we told to pray at this time?
3. What urgent petition of the prophet connects this prayer with the vision of the taking away of the continual mediation and the desolation of the sanctuary recorded in Daniel 8?
Where are the Ten Commandments recorded?

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