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 was denoted by the ten horns?
When God was about to proclaim His law to Israel, of what did He tell Moses to remind them?
8. In what language did Christ briefly describe the experiences of His people previous to these calamities?
Have the worthies of old gone to their reward?
By what name is the fifth state of the church addressed?
How important is the trial of our faith?
What promise is made to those that mourn?

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