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 God's object in making the earth?
What instruction shows that sanctification is a progressive work?
How was Moses taught during the days of his early childhood?
4. What was another memorial instituted to commemorate another signal providence in behalf of the Israelites?
8. In what language did Christ briefly describe the experiences of His people previous to these calamities?
How did David express himself on this point?
What did Christ say would be the experience of His people in this world?

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