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 perfect is the unity into which believers are brought by being baptized into Christ?
What description of the Apostle Paul's experience is in harmony with this?
What song of triumph follows the overthrow of Babylon?
5. What description is given of the beast against whose worship this closing warning message is given?
Of what was this memorial to he a sign?
How will this great event affect the world?
How numerous are these wicked spirits, or fallen angels?

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