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.

What instruction is given concerning confession of sin?
To whom, therefore, should we ascribe glory and honor?
19. In what prophetic language was the varying strength of the ten kingdoms of the divided empire indicated?
Under the new covenant, what does God promise to do?
10. What definite period of time was allotted to this great persecution of God's people under papal Rome?
8. In what language did Christ briefly describe the experiences of His people previous to these calamities?
What change will then take place in both the living and the sleeping saints?

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